What's the best antivirus? And why?

Step 1) DON'T PANIC! Take a deep breath and go grab a cup of your favorite beverage. This may take awhile.

Step 2) Clean up your pc. Remove programs you don't use via the Add/Remove Programs in the Control Panel. In Vista, you remove programs by clicking Programs and Features in the Control Panel. If you are unsure of a particular program, you can check it against a list of offenders here: http://forums.majorgeeks.com/showthread....

Clean your hard drive of unnecessary files using CCleaner here: http://www.ccleaner.com/download/......

Save to your desktop, install it, then run the cleaner. Simple, yet it will free up tons of space on your hard drive. While you have the program open, run the Registry Checker as well. This will fix invalid registry entries safely. Note that you should run CCleaner for ALL accounts on your pc.

Step 3) Create a new System Restore point. Click Start%26gt;All Programs%26gt; Accessories%26gt;System Tools%26gt;System Restore. Create a restore point. Now delete all but this most recent restore point. Click Start%26gt;All Programs%26gt;Accessories%26gt; System Tools%26gt;Disk Cleanup. Click More Options tab, and then under System Restore, click Clean up. Click Yes to remove all but the most recent restore point. Click OK, click Yes, and then click OK.

Step 4) Now let's start to get rid of those nasties. Download the following programs to your Desktop. You should then install each one, but don't run them yet. Patience...patience.