Solved BIOS doesn't detect OS.

May 9, 2015 at 22:44:57
Specs: Windows Vista, Intel Celeron 1.7 GHz / 1.49 GB of RAM
A few days ago, I tried installing an OS (windows Vista) for the first time on my computer. It was previously running win XP.
Now, while I was installing win Vista, I had to choose a different drive than the one having XP due to storage issues. I managed to install it without further problems and it worked really smooth.
Then I felt that I had no need for Win XP so I deleted its WINDOWS folder from the drive it was in. But while rebooting, the BIOS menu still asked me to choose an OS between XP and Vista. I then searched the internet and found out that removing an OS from the dual boot menu was more difficult in win Vista than in XP. (In win XP you could just modify the boot .ini file.) So, I instead decided to decrease the time the dual boot menu showed, to zero. While I was doing that, I am quite sure I set the default OS to Vista. But while booting, the BIOS simply selects win XP in a split second (because I set the time to zero). Windows Vista option is still there but I can't select it. Then it says 'drivers not found' (because I deleted the win XP folder). I have an AWARD BIOS and I tried pressing F8 while booting to open Windows advanced boot menu, but strangely, it does not show Win Vista. I don't know what to do. Prior to this I saw that my C: drive (with win XP) was my active drive and my F: drive (with win Vista) was my boot drive.

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May 10, 2015 at 02:21:03
✔ Best Answer
Try tapping F8 before windows would normally start to load. That should bring up the boot menu but I think it will be the XP menu since that's your default OS. But give it a try and see if it allows you to boot to another OS.

Or, if you hit the PAUSE/BREAK key at just the right time to pause loading at the OS selection screen you can select Vista at that point.

If you can get Vista to load then you need to run BCDEDIT or a third party application like EASYBCD to edit the entries.

If neither of those work you'll probably have to either do a fresh install or run BCDEDIT after booting from the Vista disk. From:

"BCDEDIT works from installation boot dvd too. If you mess up with a setting and you cannot boot, just boot from DVD and enter Repair Computer, then go to command prompt and there you go. You can play again with bcdedit to restore your system back."

More detailed info here:

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