The following items are security tools that I have loaded on my computer, naturally don't take my word for it. You download all at your own risk of course. I can't guarantee how these will operate on your computer nor your level of computer knowledge to use the tools well.
Windows Defender http://www.microsoft.com/downloads/details.aspx?FamilyID=435bfce7-da2b-4a6a-afa4-f7f14e605a0d&DisplayLang=en
Spyware Doctor http://www.download.com/3000-8022_4-10293212.html
AVG anti-virus software http://free.grisoft.com/doc/1
Adaware spyware software http://www.lavasoftusa.com/software/adaware/
Sygate Firewall http://www.pcworld.com/downloads/file_description/0,fid,8132,RSS,RSS,00.asp
Then there are the regular tasks that I perform on a weekly or bi-weekly basis:
Open each of your 3 Spyware/Adware programs (Microsoft. Adaware and SpyDoctor). Run a full scan on each at least once a week.
Open AVG and update plus do a full computer scan every day. It does this automatically at 8am AWST so do it yourself each day if you do not turn on computer before 8am.
Go to Start. Go to Control Panel. Go to Internet Options. Go to General tab. Delete all Cookies. Delete all Temporary files. Do this once a week.
Go to Start. Go to Accessories. Go to System Tools. Go to Disc Clean Up. Perform a full disc clean up. Once a week.
Go to Start. Go to Accessories. Go to System Tools. Go to Disc Defragmenter. Perform a full defrag. Once a week.
Back up all your files/folders onto CD's, external drive or a laptop. Once a month at least, depending on the amount of work you do.
For email security, I do the following:
Set your email to be read in Text Only format by going to Outlook Express, Tools, Options, Read and then check the box that says