Free Anti Spam Software

After my ex and I split, he kept my computer which is a Dell, purchased in 2004. Once divorce was final I got my computer back - sabotaged. It came back loaded with worms and viruses. Also, the date was wrong - behind by two years! I restored the computer to its original settings - like it came out of the box and started over. Then I subscribed to and installed virus protection, firewall, spam filter, etc. After some time and money and lots of effort, I think I have everything cleaned up and things are running fine. My problem is the date is still messed up. I know how to change it, but everytime I do, my current subscriptions instantly become expired because they think two years have magically passed. Is there anything I can do about this, or just live with it?
I tried changing the date and then reinstalling. It didn’t work. Thanks anyway!

I am considering running Windows LIve OneCare which doesn’t have an Email Spam Filter

I have deployed Symantec’s Premium Anti Spam on an SBS box with Exchange running. The heuristic option is grayed out. There is no option for creating custom policies either. The user manuals are okay but a bit lacking in answering questions. This is version 5 as an add on for the Premium Groupware. License is activated and showing 344 days left but only the default settings are changeable. Settings for SPAM detection is set at 25 but still an awful lot of SPAM is making it through. I am using some standard RBL providers for the whitelist/blacklist. If I can figure out how to turn the heuristic levels on I could gain some measure of control.