Can anyone help me to determine if my PC is infected by virus?

Norton AV ran differently than before: no more scanning boot records and showing a strange hard disk #0 (invisible in DOS and WIN).

“Drive access error” popped up same for the strange #0 and all original primary and extended partitions (C: to F:).

“Drive access error” reads like: "Unable to read the boot record on hard drive #0. Check to make sure the drive is ready." with 3 options for me to click: "Retry", "Continue" and "Help".

Only "Continue" works... scaning Fils only, no more on Master boot nor Boot records.

The setting of PC: Win98SE, FAT32, Norton for Win9* (virus list dated 24-Nov-06), Ad-Aware SE 4 Home, avast!, and Spybot S&D.

Would it be related to a active partition on a connected movable drive (MD)?

I did Norton when the MD was connected by USB. There are 4 FAT32 partitions and 1 NTSF partition there. But the Norton problem persisted when the MD was disconnected.

By the way, how to safely remove the active atribute from the primary partition on the MD, which was activated accidentally.
Thank you.

Hi sorry i do not know the problem but i ditched norton anti virus and just use avg anti virus and have'nt had any problems what so ever. I would consider AVG, and it's free.

I started getting this same problem after installing Spybot and running it's "Immunize"; it's as if Spybot blocked access to the boot records on all of my hard drive partitions. I had to go into Norton Antivirus' options and uncheck Master Boot Record and Boot Records to make NAV get along with Spybot. The other option would be to run "Undo" in Spybot's Immunize section and uninstall Spybot, if you really want NAV to be able to access boot records again.