Js/downloader agent virus

My AVG has detected a js/downloader agent virus. I have read the the posts about deciding if you want to reformat your hard drive. I haven,t found anything about what to do if you do not want to reformat. Can someone help me with this??
 
Would have been helpful if you had given the actual name. In that absence:

Control Panel> Java> temporary internet files> Settings> delete.
 
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