No problem. Just remember that ClamWin does not support automatic scanning of your files yet. You will have to scan files manually before opening them. But this is to change in the near future.
I kind of read the license agreement for AVG! Free for fun, expecting to find the usual "we will not disclosure your information to third parties", but instead found "we will disclosure your information to third-parties and we will do it for at least ten years. If you don't want that you have to send us a signed letter by mail to our headquarters in the Czech Republic." I instantly stopped using AVG! Free