Intemittant deleted _Restore Folder! Trojan?

Hi,

I suspect that I have been hit by a Trojan, or an internet worm.
After browsing a site (some java script graphics manipulation on the main page), I visited another site to download a couple of files. fine except I could not select the folder to store the File. cancelled the download, tried again..Same prob, Closed IE. Reopened IE, went back to the download site..Same story.
Decided that a reboot was in order.. as the sys rebooted, I was greeted with a corupted BIOS message (Have Dual BIOS M/b BX-2000 Gigabyte)Bios was reloaded. Could only eneter ME in Safemode, Tried a restore.. No restore points.. Checked the _restore Folder.. Empty..
Entered MSCONFIG, removed most prgs from the start up, including F-Prot, Talkworks, Zonealert. System restarted ok. Reenabled 1 at a time to find the above listed prevented a clean restart. Uninstalled these progs. then only to find that my DUN settings/properties changed, plus after validating my id with my isp, was unable to log on to the Internet.
Did a install over of ME, ran Vet AV, then Norton AV, F-Prot, Tauscan.. Found nothing.
System ran fine for a couple of weeks. Untill.. the system bootup and lockedup, not sure of the reason, common MS Office Shortcut Bar, Symantic Talkworks. No programs installed in previous 48hrs.
Restore?. Nope..All restore points deleted, as were the contents of the "_Restore" Folder..
Any Ideas?
System Details
PII 400MHz
Gigabyte BX2000 MoBo
128MB SDRAm
WinME - Upgraded from Win98se
8.4Gb + 6.4Gb HDD's

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