This is a silly spell but it will actually work with the intent in mind. Trust me, I've used it successfully more than once... and it's fun, too!
Cut out seven stars from colored paper... one of each color for the days of the week:
Monday: White
Tuesday: Red
Wednesday: Green
Thursday: Purple
Friday: Pink
Saturday: Black
Sunday: Orange
Chant over your stars:
"Magic stars so bright and true
Protect my monitor and CPU
May my keyboard and mouse always work for me
By the Techno-Goddess... so mote it be!"
Place all the stars in a bag or box with a little sage, thyme, or rosemary. Each day for a week place the star on top of your monitor or computer that is the right color for that day. (See above.) If after a week your computer still has problems, you can continue the spell for another week or two. In desperate situations, pick up the phone book and call in your local computer wizard!