OK...I have a Gateway Desktop 1.8 GHz with 128MB DDR memory. After installing Norton System Works and Norton Firewall my PC is horribly. My brother-in-law just had same stuff installed, but also had his memory upgraded to 512. He said his computer has been slowed up. So I was thinking it would help to upgrade my memory. I'd like to go up to at least 512. Is there anything I need to know before I just buy it? Like what brand is good? Is there anything else about my computer that I need to know? Will this really help speed things up now that I have the Norton programs on here? Any help you can provide I would appreciate!!