Computer help

[Sol_Solis]

Alright, I got some problems with the gfx division of my comp and I need some help.
1. Whenever I open a page with quicktime my computer crashes, whenever I try to launch an application with quicktime my computer crashes.
2. Whenever I try to play some sort of game (stepmania, myst etc.) my computer crashes on the load.
AFter I did this suggested at another forum because myst was randomly crashing

Then, use Windows (not Internet) Explorer to search all hard disks and partitions for \temp, \tmp, and \temporary folders, and delete any files in these folders that aren't currently in use. If you can delete a file in a temp folder, it's not in use - if it's in use, Windows won't let you delete it.
-- a. Close all open applications, and open a Windows Explorer session. (Click on Start > All Programs > Accessories > Windows Explorer.)
-- b. Click on Tools > Find > Files or Folders.
-- c. Type temp in the Named: box.
-- d. Click on the arrow at the right end of the Look in: box and then click on the disk drive to be searched.
-- e. Click on Find Now to start the search.
-- f. Click on the temp folders found to open them.
-- g. Delete any files in these folders that aren't currently in use.
-- h. Repeat for tmp and temporary folders.
-- i. Close Windows Explorer back to the Desktop.

it started happening, just to give you an idea (maybe I did something wrong or possibly could have?)
Help would be greatly appreciated :]