I own a very old Compaq Presario Vista PC, and it's really not being used right now. Right now, it has an AMD Athlon X2 4450e 2.3 GHz processor with 3 GB of RAM, and a 250 GB Hard Drive. I know a fair amount about the components of a PC, but I have never actually built one. I would like to upgrade to 8 GB of RAM and install Windows 7. I don't think that would be too hard. What I would like to know is if I would need a new Hard Drive, or if I can completely wipe the one I have. I also know that each Motherboard has a max amount of RAM, how do I find that? I definitely don't want to get too much RAM.
My other question is, would this be worth it? I am 14 and I have $120 to spend, but I can get more soon. So would it be worth it to upgrade this Vista, or should I just build a new one from scratch? Also, I am a gamer, and my Windows 8 PC has 3.2 GHz processor, 8 GB RAM, and 1 TB Hard Drive. Would I be able to settle for 4 GB of RAM on the Vista?
Any help appreciated.
Also, how much would it cost to get a *decent* gaming PC? And I definitely want to avoid Windows 8, if possible.