Virus.. What to do

I have noticed recently that when I click on links or in blank fields that I need to fill on web pages, that new pages open with advertising. For example it happened when I went to type this text. Figured I had a virus and ClamXav-scan found the following attachment, below my sig..



Looks like three files are infected. Can I simply delete something to get rid of this problem? What is the best solution??



Thanks in advance...

Attached Images

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