Black screen when windows boots up (unique!)

Hello everyone, i seem to have a problem that i can't find the answer
to and is somewhat hard to explain.
It started when i needed to switch PCI-E cards between a Geforce
7900gt to a GeForce 7600gs, i did so without taking into consideration
any drivers installed, as i figured the drivers should be the same and
it seemed like a good idea at the time, what happened was the
following:
Computer booted up, loaded BIOS and continued to load windows.
As soon as windows loaded the screen turned black, to be exact the LCD
monitor's back light was on (meaning the screen isn't turned off) but
all its showing is black...
I then tried using the "VGA Mode" option available in the F8 bootup
menu, to which windows loaded fine.
What i did then was download a new set of drivers from the Nvidia
website and uninstall the previous ones, i didn't want to install the
new drivers right away as i wanted windows to load without any drivers
to let the settings take effect so i restarted my computer.
After which the problem repeated itself, i was back in square one and
now no option in the F8 menu had any effect.
I also tried getting into safemode only to find out that safemode
isn't working, it just displays
a list of files and gets stuck, it wont load no matter how long i wait
(a few hours)
What i attempted to do next was repair my windows using the
installation disk, which also seemed like a good idea however, as soon
as windows copied its needed files into the hard drive and rebooted to
continue the installation i got the same problem, so now not only do i
have a black screen but its also stuck in the windows installation
phase (before i attempted the windows repair option i was able to
access my computer via network, which meant that windows was working
fine but i just wasn't able to see it)
I even tried switching monitors and video cards (had an old PCI video
card laying around) which didn't help.
What i've been thinking is that if i could somehow reset the video
card settings via the registry or maybe even delete the existing video
card driver outside of windows i could fix it, though i'm not sure how
to exactly...
Anyways any help will be greatly appreciated as i've really run out of
options and would like to attempt anything i can before i have to
resort to a full windows reinstall.
Thanks for reading!

With a failed repair xp installation,you might have to reinstall xp..However,
to try to fix,boot to xp cd,press r For recovery,select 1 For C: Press
enter for
password,type:Fixboot Agree, If you think the old video card
drivers/services
are to blame,type:Listsvc Locate & write them down,once thru,exit,type:
Disable type in the services you wrote.Or type:CHKDSK C: /R Once thru
type:EXIT Let xp start.For all cmds,read kb307654

" " wrote:

> Hello everyone, i seem to have a problem that i can't find the answer
> to and is somewhat hard to explain.
> It started when i needed to switch PCI-E cards between a Geforce
> 7900gt to a GeForce 7600gs, i did so without taking into consideration
> any drivers installed, as i figured the drivers should be the same and
> it seemed like a good idea at the time, what happened was the
> following:
> Computer booted up, loaded BIOS and continued to load windows.
> As soon as windows loaded the screen turned black, to be exact the LCD
> monitor's back light was on (meaning the screen isn't turned off) but
> all its showing is black...
> I then tried using the "VGA Mode" option available in the F8 bootup
> menu, to which windows loaded fine.
> What i did then was download a new set of drivers from the Nvidia
> website and uninstall the previous ones, i didn't want to install the
> new drivers right away as i wanted windows to load without any drivers
> to let the settings take effect so i restarted my computer.
> After which the problem repeated itself, i was back in square one and
> now no option in the F8 menu had any effect.
> I also tried getting into safemode only to find out that safemode
> isn't working, it just displays
> a list of files and gets stuck, it wont load no matter how long i wait
> (a few hours)
> What i attempted to do next was repair my windows using the
> installation disk, which also seemed like a good idea however, as soon
> as windows copied its needed files into the hard drive and rebooted to
> continue the installation i got the same problem, so now not only do i
> have a black screen but its also stuck in the windows installation
> phase (before i attempted the windows repair option i was able to
> access my computer via network, which meant that windows was working
> fine but i just wasn't able to see it)
> I even tried switching monitors and video cards (had an old PCI video
> card laying around) which didn't help.
> What i've been thinking is that if i could somehow reset the video
> card settings via the registry or maybe even delete the existing video
> card driver outside of windows i could fix it, though i'm not sure how
> to exactly...
> Anyways any help will be greatly appreciated as i've really run out of
> options and would like to attempt anything i can before i have to
> resort to a full windows reinstall.
> Thanks for reading!
>