You go to the site of the company you purchased your computer from and ask them for the restore disk for your compaq computer with your make and model It will cost you if you did not get a warranty from them.
If they are just grips, use a heat gun and heat them and they will slide off. To keep the new ones on use some sort of epoxy glue thta will bond to the metal.
Pull out you dip stick, and smell it. If it smells burnt, change the transmission fluid and filter. Use a product like Lucas transmission fluid, with your transmission Fluid. Otherwise it shop tear down time