Viruses
Usually Acquired Through Infected E-Mails, The Modern Virus Attempts To Change The Values Or Parameters Of Programs And/Or Parts Of The Operating System. Current Anti-Virus Programs Prevent These Changes By Blocking Access To The Program Files And Windows Folders.

The Best "Value-For-Money" Anti-Virus Programs Are The Ones You Purchase And Then Update Using The Internet. This Ensures You Have Quick And Ready Access To The Latest Protection.

AVG
AVG Version 8.0 Anti-Virus     Free     www.grisoft.com

Worms
Usually Acquired From Infected Web Sites A Worm Is A Different Form Of Virus Or An Attempt At Hi-Jacking The Control Of Your Computer. Mostly Aimed At Current Windows Operating Systems The Best Protection Is To Ensure You Keep Your Windows Critical Updates Current Through The Windows Update Site.

Cookies
In Most Cases Cookies (Spyware) Are Harmless But The Increase In Companies Using Tracking Cookies For Marketing Purposes Is Increasing Daily. A Few Cookies Wont Hurt But When You Get Over 30 It Starts To Adversely Affect Your Internet Performance And Then Your Computers Performance. The Highest Total We Have Seen On A Customers Computer Is 28,000 Instances And Took Over 5 Hours To Remove. You Can Download A Small Program Called Ad-Aware That Will Manage Your Cookies If You Run It Once A Week.  www.lavasoft.de