0xc0000428 Windows doesn't recognize driver signature.

I've installed Win7 x32 on my sister's dell optiplex gx280 a few weeks back and has been running great until recently. The computer reboots after only a few minutes onto windows, and brings me to the boot manager saying that windows doesn't recognize the driver signature of this file, that a recent change if software of hardware or malicious program from an unknown source might have caused this, but doesn't say anything about which file was corrupted, Status: 0xc0000428.

I either have the option to press escape or enter, and when i press enter, it brings me to the same boot manager. I can't seem to be able to boot from any cd either, have tried that win 7 cd from my own computer and it boots just fine. Once again, it brings me to the same boot manager after attempting to boot from the cd.

Strangely, it did manage to give me the boot menu a few times, so I went into safe mode and did a system restore, but that didn't work either. And in the few rare chances that it give me the option to be able to go in last known good windows settings, it just reboots after a few minutes into windows and just takes me back to that boot manager error. and just sticks to that boot manager when pressing enter.

After a while of screwing around, I couldn't do anything anymore, as the comp didn't recognize the hard disk first, then after a while it didn't recognize the CD-ROM either. I did check in the bios, it say that the hard disk and the cd-rom were there, but "are not present". Is the computer gone to crap? Please let me know. :P


Sorry for long, and if anything is not clear enough please let me know, thanks in advance!