For the spyware problem run Spybot, then Spywareblaster, then Lavasoft Adaware.
They need weekly checks to make sure updates are downloaded . The best anti virus freebie is AVG. You can get additional free scan only from Trend Micro or pandascan.
Its important to scan ALL drives; C, A floppy, and any USB pens you have. The viruses are tricky devils.
Its also worth looking at ShieldsUp to see how vulnerable your machine is google shieldsup to find it.
Do you have a firewall? Zonealarm is the best freebie.
Sorry if i am teaching granny to suck eggs here but who is using the machine? Anyone viewing porn? Not a judgement but you need to be careful to scan and scan to prevent reinfection.
Hope its some use.
jc, August 2007