Hi tinaandliz
Lots of good advice has been given here already about this problem and your original help very good. The bottom line is the amount of RAM you informed us your friend has, is not alot. This is common problem with people trying to overwork their PC. Too many programs opened on the task bar and the PC runs out of available RAM to do work with.
If you press the following keys ctrl - alt - del.
You will get a box, the third tab shows some graphs about how hard you are pushing the PC. The first tab shows all running progs. Some programs will bale out if not enough ram to work like Internet Explorer.
So...close all progs not immediately needed.
Do the clean up.
Don't work so hard?
Regards
Silverhelper.