This solution is worse, far worse, than the disease.
If you have any doubts on this issue, please post a question in the System Security forum of this site.
You definitely need an anti-virus software and a firewall. They are NOT sufficient to protect you.
For an anti-virus, I recommend, without reservations, the AV software used by the majority of the experienced people helping others here, namely, Microsoft Security Essentials. MSE - Microsoft Security Essentials
Uninstall any AV, anti-whatever software you have installed.
Uninstall any 3rd party firewall software.
Turn on Windows Firewall.
Do NOT install any of those super-duper speed-up-your-computer/clean-up-your computer programs.
Do install, if you would like, the number one "cleaner" program. This program is free and is miles and miles above anything else in this category.
The program is:CCleaner