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okay so your laptop in not infected .. but you want an anti-virus to protect it ???
there are free versions of anti-viruses like:
avast : http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html?part=dl-85737&subj=dl&tag=button
AVG : http://www.avg.com/ww-en/download-file-stb-afh.tpl-mcr8
here is a full list of free security software http://www.filehippo.com/software/antimalware/
use linux, there are few malicious program to that os. if u want to use windows u can get and anti-virus as dodomaroc told, but as allways the best secaurity its a good user, read some guides about the topic
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http://www.techsupportalert.com/best-free-anti-virus-software.htm Any of these will work fine, Using Microsoft Security essentials now, running smooth! ;) :)
Dodomaroc gave you the best tips for Windows, and fedep3's tip is worth considering if you'd be up for switching to Linux.
To build on Dodomaroc's suggestions, you could also try Microsoft Security Essentials. It's lightweight and pretty easy to disable if you don't like it (without having it leave a lot of junk on your system). At the moment, it's not as good as AVG or Avast, but it's getting better and might now be considered to be in the same ballpark.