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: Missing operating system message, cannot re-install windows 7

30 Aug 2010   #21
zigzag3143

Win 8 Release candidate 8400
 
 

Quote   Quote: Originally Posted by rjs1974 View Post
The extended test using WD diagnostics (took 2 hours) came back with no errors. Will try chkdsk again - did not work yesterday though - something about RAW volumes?

EDIT - trying chkdsk /r from command prompt gave me this message:

The type of the file system is NTFS. Cannot lock current drive. Windows cannot run disk checking on this volume because it is write protected.

What now Greg?
Thanks!!
I defer to greg, just a quick drive by. If it is indeed write protected you can change that by booting as admin into a cmd prompt (shift +F10 on boot).

Go to the drive and type attrib -R *.* at the c:\> prompt


My System SpecsSystem Spec
.

30 Aug 2010   #22
gregrocker
Microsoft MVP

 

Follow Zigzag's guidance on running chkdsk /r as Admin.

Then follow the tutorial Karl posted to wipe the HD to clean install Win7.

Let us know how it goes.
My System SpecsSystem Spec
02 Sep 2010   #23
rjs1974

windows 7 home premium 64bit
 
 
FIXED!

Hi everyone,

Ok all resolved now. It turns out my PC was set up in a RAID config, but somehow the BIOS settings had reset and the SATA config had reverted to IDE, not RAID - no idea how though...

Anyway, amending this back to RAID and restarting means Windows boots as normal.

Many thanks for all the help and advice. Turned out to be a two second fix. Apparently this is the most common cause for the "Missing Operating System" message, so anyone else, look here first!
My System SpecsSystem Spec
.


02 Sep 2010   #24
neo101

WIN7 Ultimate 64bit
 
 

Quote   Quote: Originally Posted by rjs1974 View Post
Greg,

Yes both HDs are shown in the BIOS, and no, no RAID array. It seems the Win 7 partition has been corrupted - Startup repair said the table was corrupted, but Testdisk could not find any partition to fix....
Tut, tut

Gregrocker clocked you @ the 16th hurdle - good on him!
My System SpecsSystem Spec
Reply

 Missing operating system message, cannot re-install windows 7




Thread Tools





Similar help and support threads
Thread Forum
new Win 7 install enable AHCI - Missing operating system
I've had some problems with drivers after installing Win 7. Got all that fixed and had a problem getting the pc switched on. Changed WOL settings and it seemed better, but I was getting a checksum error. I then found this thread-...
General Discussion
Win7 - 'Select the operating system you want to install' MISSING
I am installing Win7 Ultimate (CLEAN Installation) on my Desktop, and I noticed that I do not have the options to select either 64bit or 32bit as shown in the attached pic and from the below link. If I DO NOT see these options, does this mean my Win7 DVD is a OEM version? Sorry, I am rusty on...
Installation & Setup
"operating system not found" message when trying to install windows 7
a friend of mine has a sony vaio laptop with windows 8 on it,but she wants windows 7(plus there is a problem with the laptop,the internet eplorer doesnt open,the window opens for half a second and then closes,and no internet-related application works).i first used a boot usb,configured the bios so...
Installation & Setup
Missing Operating System after bad HDD driver install
Hi everybody...I have a Dell Inspiron15r model N5010 that I was trying to upgrade to windows 8 Pro when I went and downloaded many of the drivers from Dell so that I had all the latest and greatest. in my quest for quickness, I accidentally installed a driver for a HD that was listed when I meant...
Installation & Setup
Missing operating system windows 7
Well I decided to build a computer because it was on my bucket list. I probably got a little deeper than my talent. Someone at the store said I could get some more performance using an SSD for the operationg system. I put the computer together and everything booted the first time. Imagine that. So...
BSOD Help and Support
Missing Operating System Windows 7
I am getting the "Missing Operating System" message on boot. Here is the strange thing...if I change the boot order in the BIOS and have CDROM first and choose not to boot off of it Windows 7 loads fine. If I put HARDDISK first then I get the missing operating system message. I have tried running...
Installation & Setup

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 03:19.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App