Don`t worry, you can learn step by step, with time, if you want.
This is the best place for it 8)
Relax, you can start a thread (new topic) and make your questions or you can browse a little and try to learn.
You can use the ‘search’ buttom above too and look for an specific topic.
MomC, that file is under your temporary files folder.
You can delete it directly (go there and click del) or empty that folder by your browser. Generally, Tools > Options > Genneral tal > clean cookies, clean temporary files…
Could you do that?
What is the result?
If everything fail, can you schedule an avast boot time scanning (right click the skin, choose the scheduling option and check to scan archives).
Good luck. Wellcome on board.