Buying the right RAM is essential if you want your computer to work. It is the easiest way to increase your PC'S/LAPTOP'S RAM.
1. If it is a desktop PC usally it will have DIMM ram, if it is a Lapto ram it will use SO-DIMM RAM
2. You have to choose the correct ram, the frequency the type, e.g PC-5300 667MHZ OR PC-4200 533MHZ, to check out what your computer is compatible download a PC wizard and it will do a check on your computer andf give you information about the currently installed RAM.
3. After you have found out what ram to buy, go ahead and buy one of ebay, you want to buy a good brand to obtain stability in your system. you would be paying around $120-$160 for a 1gb Kingston or Corsair Ram