Have you run an anti-virus program? You can download one for free from the downloads section of this website - or my personal favourite - the Avast antivirus program.
Im sure it is possible for viruses to disable both of the things mentioned - but i doubt one would do both.
If i were you i would:
1) Run an antivirus program
2) Run an anti Adware program (adaware or spybot)
3) Back up you files with either a USB memory key or onto the network or if you have managed to get the anti virus to get the CDR drive working with that.
4) Make a win98 boot disk
5) Run Fdisk and format the drives
6) Reinstall windows
7) replace files
I wouldnt bother with system restore etc - its never worked for me and the only real way for you to be sure about a clean disk is to completely reformat it.
I hope i have got the right idea!! Let me know if you need any more info.
AMD 2500+, 512mb Mem, 160GB (2xSATA 80GB in RAID0 array), K7N2G-ILSR (using on-board graphics and sound (for the moment ;-) ))
How many windows \"errors\" can there be??!!!