can you not remove the battery or reset the CMOS so it loads the default BIOS settings?
just a thought......maybe you already done this
could it be one of those Trojans that inserts themselves into your memory? We experienced one of them one time, had to use "Memory Washer", "trojan remover", "regscrubxp" and "your uninstaller 2008" to completely clean her out of the computer...( think it was "trojan remover" and "regscrubxp" that did the trick )
wish ya luck , snap