Mainly simple things such as installing hardware. i can install...
~cd-burners
~ cd-roms
~ dvd-roms
~ram
~a new motherbord
~ethernet cards
~modems
~audio card
~video cards
~almost any other kind of card
~a new harddrive
ect.

i can also fix some problems, it depends on how complicated the problem is. Ask me and i will tell ya if i can fix it.