Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Bootmgr is missing, accidently deleted OS

11 Mar 2011   #1
koleolsen

Windows 7
 
 
Bootmgr is missing, accidently deleted OS

hey ive got this problem that happened to me yesterday

i had an unexpected shutdown, i tried to reinstall the windows 7 as it wasnt working. i formated the partition that the operating system was on, but then was unable to install the new OS.

it wont let me delete partitions or create new ones.

now everytime i start the computer it is missing bootmgr.

ive tried unclicking the hard drive cables which gets me into the repairing windows bit. but this doesnt help as i deleted the OS.

Please someone help?


My System SpecsSystem Spec
11 Mar 2011   #2
bigmck

Windows 7 Home Premium 32-Bit - Build 7600 SP1
 
 

Quote   Quote: Originally Posted by koleolsen View Post
hey ive got this problem that happened to me yesterday

i had an unexpected shutdown, i tried to reinstall the windows 7 as it wasnt working. i formated the partition that the operating system was on, but then was unable to install the new OS.

it wont let me delete partitions or create new ones.

now everytime i start the computer it is missing bootmgr.

ive tried unclicking the hard drive cables which gets me into the repairing windows bit. but this doesnt help as i deleted the OS.

Please someone help?
I am not sure what procedure you used to install, so I will just start from square one. == Put the Windows DVD in the DVD drive. Boot your computer. This should get you up and going to install. When you get Windows installed you can then adjust your partitions. === You said above "you were unable to install the new OS". What problems did you have? Fill us in a bit more on what happened when you tried to install Windows and we can go from there. Thanks,
My System SpecsSystem Spec
11 Mar 2011   #3
Bare Foot Kid
Microsoft MVP

W 7 64-bit Ultimate
 
 

Hello koleolsen, welcome to Seven Forums!


Now that you have done a format that didn't help, the best way forward is to completely wipe the entire Hard Disk Drive and start from scratch, have a thorough look through the information presented below and be sure to post back with any further questions you may have and to keep us informed.


After you have copied out or made back-ups of the data you need to save to external media, use Step One of this tutorial at the link below to do a wipe (secure erase) to the entire Hard Disk Drive / Solid State Drive.
  • Then if you do not want to create the new Windows 7 "System Reserved" partition use the outline in Step Two #2 to create, format and mark Active a single 100GB partition to do the installation to.
  • If you do want to create the "System Reserved" partition use the outline in Step Two #3 to create, format and mark Active the System Reserved partition and then create and format the 100GB partition to do the installation to.
Either way, running the "clean all" then creating and formatting the partition(s) using diskpart will get you the best possible space to do a clean install of Windows 7 to; you can always extend the Windows partition to include the remaining unallocated space on the HDD / SSD or create additional partitions after the installation completes if you choose.

SSD / HDD : Optimize for Windows Reinstallation

DISKPART : At PC Startup

Do a Clean Install with a Upgrade Windows 7 Version
My System SpecsSystem Spec
11 Mar 2011   #4
theog

Microsoft Community Contributor Award Recipient

ME/XP/Vista/Win7
 
 

It would be worth checking the hard drive with the manufacturer's diagnostic tools.
Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.
HD Diagnostic
My System SpecsSystem Spec
11 Mar 2011   #5
gregrocker
Microsoft MVP

 

You must boot the Win7 DVD to wipe the HD and install: How to Boot your Computer from a Bootable CD or DVD.

Once you boot the DVD, select Repair My Computer to Startup Repair - Run 3 Separate Times followed by SFC /SCANNOW : Run in Command Prompt at Boot and System Restore run from the Repair console's Recovery Options list.

Follow these steps to re-install windows 7
My System SpecsSystem Spec
13 Mar 2011   #6
koleolsen

Windows 7
 
 
Dear BigMck

thanks for the reply,
firstly i was having problems with the computer and it wasnt loading my OS it just came up with a blank screen, so i thought reinstalling windows would be the best bet to fix the problem. i inserted the cd and went on to the advanced options to create and delete partitions, but it wasnt letting me erase any drives or create new ones and was telling me one or more drives were dynamic cant install to partitions that were previously created. i thought maybe if i format the drive i will be able to install the os on the old partition but failed, erasing my os and leaving me with nothing, even erasing the backup partition. now every time i reboot i have boot manager is missing press alt ctrl delete to reboot.
My System SpecsSystem Spec
13 Mar 2011   #7
koleolsen

Windows 7
 
 

Quote   Quote: Originally Posted by Bare Foot Kid View Post
Hello koleolsen, welcome to Seven Forums!


Now that you have done a format that didn't help, the best way forward is to completely wipe the entire Hard Disk Drive and start from scratch, have a thorough look through the information presented below and be sure to post back with any further questions you may have and to keep us informed.



After you have copied out or made back-ups of the data you need to save to external media, use Step One of this tutorial at the link below to do a wipe (secure erase) to the entire Hard Disk Drive / Solid State Drive.
  • Then if you do not want to create the new Windows 7 "System Reserved" partition use the outline in Step Two #2 to create, format and mark Active a single 100GB partition to do the installation to.
  • If you do want to create the "System Reserved" partition use the outline in Step Two #3 to create, format and mark Active the System Reserved partition and then create and format the 100GB partition to do the installation to.
Either way, running the "clean all" then creating and formatting the partition(s) using diskpart will get you the best possible space to do a clean install of Windows 7 to; you can always extend the Windows partition to include the remaining unallocated space on the HDD / SSD or create additional partitions after the installation completes if you choose.

SSD / HDD : Optimize for Windows Reinstallation

DISKPART : At PC Startup

Do a Clean Install with a Upgrade Windows 7 Version



thanks bare foot kid for that info it has given me hope i will try this method tomorrow afternoon and let you know what happens

also the only way i can get to the windows installation windows is by unplugging the sata cable from the hard drive and then it runs the cd and then i reattach the cable to the hard drive and go from there. it doesnt seem to want to work when i leave the hard drive cable connected and boot from windows 7 installation.
thanks though and will keep you posted


also thanks to all that have posted reply it is very much appreciated

thanks again

kole
My System SpecsSystem Spec
13 Mar 2011   #8
gregrocker
Microsoft MVP

 

Don't you want to try repairing Win7 before reinstalling it?

Try setting your Win7 HD as first HD to boot in BIOS setup, after the DVD drive which should be set first to boot.

What happens then?

Next try booting the Win7 DVD. Do you receive a prompt to "Press any key to boot from DVD?" If not, it is not set first ot boot in BIOS setup, or the DVD is corrupt. Try also triggering the DVD using the one-time BIOS Boot Menu key given on first boot screen.

If DVD boots, select Repair My Computer on second screen, accept any offered Repair, if it fails to start Win7 then boot back in to Startup Repair - Run 3 Separate Times. It should automate System Restore and System File Checker - if not, run System Restore from the Recovery Options list on DVD Repair console, then run SFC /SCANNOW : Run in Command Prompt at Boot
My System SpecsSystem Spec
14 Mar 2011   #9
koleolsen

Windows 7
 
 

sorry greg rocker theres no operating system as i formated it, dumb mistake of course.

to bare foot kid, thanks for the links i am currently amking partitions, 200mb reserved success
completing the 100gb partition as we speak and formating as ntfs currently at 80%

will let you know how it goes.
My System SpecsSystem Spec
14 Mar 2011   #10
Bare Foot Kid
Microsoft MVP

W 7 64-bit Ultimate
 
 

Be sure to post back here to keep us informed.
My System SpecsSystem Spec
Reply

 Bootmgr is missing, accidently deleted OS




Thread Tools





Similar help and support threads
Thread Forum
Accidently deleted my WIFI adapter, how to get it back?
So I was trying to manually turn my WiFi adapter on because the button is broke and I ended up deleting it. I'm not sure which WiFi adapter I had so I cannot re-install it. Is there any way to find out what adapter I had, or to undo the delete?
Network & Sharing
I accidently deleted a needed partition and now it is 'Unallocated'.
As I said in the title, I was using 3tb+unlock to open up the last terabyte of space on my 3tb drive and even without me telling it, it just assumed that I wanted the 1tb hard drive that I save my family photos on to unallocate. As the drive is dying but not there yet...hense the new...
General Discussion
Deleted partition and new HDD -> BOOTMGR is missing
Hi guys and gilrs, Yesterday I bought a new 1.5TB hdd and decided to make from it one new partition called "X:". My old hdd was 150GB(separated into "C:" and "D:"), so I deleted "D:" and expanded my "C:" with the unallocated memory from the deleted partition and formated the new expanded "C:"....
Installation & Setup
Internet explorer accidently deleted and is not recovering
Hello, I have windows 7 ultimate 32bit, intel dual core e5400, ati raedon 1gb hd4350, 2GB RAM. My internet explorer 9 wasn't loading web pages though i had an active internet connection. Being a newbie, i deleted the internet explorer from c:\program files. Most of the files except one named...
Browsers & Mail
Accidently deleted a gadget
Hi, I didn't exactly know which forum to start this topic, it includes talking about backup but it also talks about Windows 7 customization. I thought it'd be sensible just to post it it General. So, a few days ago I deleted my Norton 360 desktop gadget. Usually it would appear in the gadgets list...
Gadgets
Accidently deleted my downloads folder
One time I accidentally put a shortcut of my downloads on my desktop, and then deleted it and it deleted my whole downloads folder. Fortunately, I had a backup and got everything back. But programs like Opera and Bittorrent think my downloads is on my desktop. Is there anyway I could change this?
General Discussion

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 09:02.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App