I am a novice computer user (photos, shopping on line, etc.) so I was nervous about the purchase. However, after I figured out how to get the panel off the computer all that I had to do was push it into the slot (easy to find) until it clicked, which I had my husband do because it really is hard. Now our computer runs very fast, there's almost no hesitation when you change from one web address to another. And the kids games run very fast, too with little or no hesitation. Our computer is about 7 years old and we have Windows XP. Love it!!!