avast won't let me on the internet until i do a smart scan

avast is constantly finding the same virus? even though each time the antivirus says it is successfully removed. On reboot it will not allow me to get on the internet unless i do a smart scan. The file it seems to find is associated with my internet stick. Seems to be a false positive.

More details would be helpful, file name, location and malware name given ?

A screenshot of the avast alert could also be helpful.

This may well be best continued in the viruses and worms sub-forum.