uninstall any security program you are using and install these free programs
1-Anti-virus
a-avira personal classic edition(free)
http://www.download.com/Avira-AntiVir-Personal-Free-Antivirus/3000-2239_4-10322935.html?tag=lst-3&cdlPid=10831109
2-Anti-spyware
a-super antispyware free
http://www.download.com/SUPERAntiSpyware-Free-Edition/3000-8022_4-10523889.html
b- a-squared free
http://www.download.com/A-squared-Free/3000-2239_4-10262215.html?tag=lst-1&cdlPid=10832180
c-spyware terminator(free)
http://www.download.com/Spyware-Terminator/3000-8022_4-10468541.html?tag=lst-1&cdlPid=10855161
3-firewall
a-comodo firewall pro(free) (after installing it go to firewall tab then stealth port wizard and set it to block all incoming conections)
note:this won't p2p propgrams(limewire,bitcomet and etc)
http://www.download.com/Comodo-Firewall-Pro/3000-10435_4-10460704.html?tag=lst-1&cdlPid=10849947
4-browser
a-firefox 3.0
http://www.download.com/mozilla-firefox/?tag=lst-3&cdlPid=10854845
5-browser add-ons(firefox)
a-mcafee site advisor
http://www.download.com/McAfee-SiteAdvisor-for-Firefox/3000-11745_4-10493671.html?tag=lst-1&cdlPid=10663377
b-Adblock Plus
https://addons.mozilla.org/en-US/firefox/addon/1865
6-pc utilties
ccleaner:
http://www.download.com/CCleaner/3000-2144_4-10315544.html?tag=lst-1&cdlPid=10837066
eusing free registrycleaner:
http://www.eusing.com/free_registry_cleaner/registry_cleaner.htm