Remove viruses

There is a good article on how to remove viruses that you might want to study.

Of course, not getting them in the first place would be a better option!

Change which program opens particular types of file

If you want to change the program that runs a certain type of file (make mp3 files open in Window Media Player, for example):

1. Right click on a file of that type
2. Go to the “Open with” menu, and select “Choose program”
3. If the program you want to use is in the list, click it. If it isn’t, click “Browse” and navigate to the program
4. Click the “Always use the selected program to open this  kind of file” check box
5. Click “OK”

That should change the program used for the specified file type to the one that you want.