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Windows 7: Repairing Win7 Bootup after xp install

15 Jan 2010   #1
ThaDraGun

Windows 7 Build 6801 x64
 
 
Repairing Win7 Bootup after xp install

I wanted to try out something new so I was trying to install WinXP on a USB thumbdrive. Then I could have win7 on my PC then when I wanted to use XP just plug in the thumbdrive and boot into that. The online instructions said to burn the xp image to cd and then turn the pc off, boot to cd and when xp installation starts up, just install it to the thumb drive. Simple enough. It installed all the files, then at the end it said it had to reset. Normally I think it would boot back into the setup to finalize everything. It didnt tho.

Once it reset it gave me an error: "error loading operating system"

I tried selecting boot to the usb and it still gave the error. I tried selecting the hard drive that windows 7 is installed on and it gave the error. I guess because I installed XP System it changed the boot setting to look for XP. How do I get it to boot into Win7 again? I tried sticking in the win7 disc and doing a repair but it wouldnt let me. Any thing else to do, or do I have to format and reinstall win7 all over again?

thanks


My System SpecsSystem Spec
.
15 Jan 2010   #2
gregrocker

 

The tutorial on the web to install XP to a flash stick is one of the most complicated you will ever see.

Unplug the flash stick, change boot order to boot Win7 HD first. Unplug any other HD's if present.

Try starting Win7. If fail, boot into the Win7 DVD, select Repair my Computer on second screen, see if it finds an installation to repair, then click through to recovery tools list and run Startup Repair up to 3 separate times with reboots.
My System SpecsSystem Spec
15 Jan 2010   #3
SIW2

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64
 
 

I don't know which tutorial you are talking about - but I have a strong suspicion you should have disconnected the HD while installing XP from cd to the flash drive.
My System SpecsSystem Spec
.

15 Jan 2010   #4
gregrocker

 

He didn't use the tutorial I'm talkin about. It is 3 pages long as I recall.

How could he undo this?
My System SpecsSystem Spec
15 Jan 2010   #5
ThaDraGun

Windows 7 Build 6801 x64
 
 

I already tried changing the boot sequence to boot win7 harddrive first. There is actually not a automatic boot option for usb and I think thats why it had a problem finalizing. I have to press f8 to select boot from usb. Selecting boot the hard drive that win7 is on does not work.

I made sure that xp was only installed on usb. It didnt install anything on the hard drive win7 is on Im almost certain. The mbr must have been modified to look for xp and forget about win7 thats the only thing I can think of. I just dont know how to change the mbr back.

I can't use a win7 disk to repair I've already tried that and it said it wasnt compatable for some reason.
My System SpecsSystem Spec
15 Jan 2010   #6
SIW2

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64
 
 

Detach the usb stick.

Boot 7 dvd to command prompt. Type:

bootsect /nt60 sys

press enter.
My System SpecsSystem Spec
15 Jan 2010   #7
ThaDraGun

Windows 7 Build 6801 x64
 
 

Quote   Quote: Originally Posted by SIW2 View Post
Detach the usb stick.

Boot 7 dvd to command prompt. Type:

bootsect /nt60 sys

press enter.
The command prompt says X:\Sources\>
Do I have to change it to something else first? I did type it in like that and it said it was sucessful, but it still doesnt work.

I also tried changing to x:\ and it said it was sucessful, and still didnt work.
I did startup repair that was in the menu and it didnt work either.

Looks like I might have to reinstall.
My System SpecsSystem Spec
15 Jan 2010   #8
iseeuu

 
 

Quote   Quote: Originally Posted by ThaDraGun View Post
Quote   Quote: Originally Posted by SIW2 View Post
Detach the usb stick.

Boot 7 dvd to command prompt. Type:

bootsect /nt60 sys

press enter.
The command prompt says X:\Sources\>
Do I have to change it to something else first? I did type it in like that and it said it was sucessful, but it still doesnt work.

I also tried changing to x:\ and it said it was sucessful, and still didnt work.
I did startup repair that was in the menu and it didnt work either.

Looks like I might have to reinstall.
This might help you?

MBR - Restore Windows 7 Master Boot Record

Cheers!
Robert
My System SpecsSystem Spec
15 Jan 2010   #9
ThaDraGun

Windows 7 Build 6801 x64
 
 

Finally got it to work!

Found the answer on another forum. Someone else was having the same problem.
Im glad I had an Ubuntu Live Disc laying around.


From Leppie at the Ubuntu Forums:
Quote:
if you only need it to reset the mbr to factory default, use lilo:

Code:
sudo apt-get install lilo
sudo lilo -M /dev/sda mbr
What is a proper tutorial to install XP on a USB drive?

The instructions I got were:

Install "HP windows Format Utility for USB drive or DiskOnKey"
Run Application and format the USB drive to NTFS (FULL format NOT quick)
Burn windows xp ISO to disk, boot to the disk and install XP to the usb drive.

So much for that.
Glad I could fix it tho.
My System SpecsSystem Spec
15 Jan 2010   #10
gregrocker

 

MS works very hard to keep its OS's from being installed on USB drives, or else they could be carried around to any computer.

As stated earlier, this has been done with XP (only) to a USB flash drive, but the tutorial to accomplish it is one of the most complicated around.
My System SpecsSystem Spec
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 Repairing Win7 Bootup after xp install




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