Forum Post: RE: Can I add extra memory to Dell Dimension 3000 or do I need to get a new hard drive

I think I need to add memory to my dell cause my hubby told me there was an error message but he failed to tell me what the message said. This happened before because it was beeping. Anyway, can you tell me if I can add extra memory. Also will I be able to switch from XP to windows 7?