Hi guy's! So, recently i started thinking about building my own gaming pc, and a thought occured to me. Now, in Holland we have a store called "Noppes" where you can basiclly can bring in all kinds of crap, and they have loads of desktop pc towers standing there running Windows XP for about 20-30 Euros, so that's really cheap. Now, these are of course very out of date for gaming, so my thought was: if i bought this PC, would i be able to upgrade the CPU, Graphics card, HDD, and the OS? Or would they have been incompactible due to age? Also, if it's possible to upgrade the CPU, will i have to look for a different mobo also? Thank's in advance!