What kind of virus is it? Maybe you or your brother can do a google search for "type of virus" repair

There are a number of virus fixes available from the internet.

AND install AVG (by Grisoft) on your computer, and allow it to update. It's free, I use it, and it has nailed virus in mid-hatch on my machine! In fact, installing AVG 8.1 might be all you need to do - run a scan right after you download it!