Hi im looking to build my first gaming PC and to save a lil bit of money i was wondering if i could take my HDD from my current computer (which is 280 GBs) and wipe out everything except the OS (which is windows vista home) any suggestions of places to find free windows 7 OS or whats the cheapest way to do that
Depends. Is the hard drive EIDE or SATA? And there are ways in which one could download an OS for free but I'm not going to mention it here on the forums. Linux is free until you find what you're looking for.
you dont want to save movies to an ssd.... i could fill 100 gigs within a week of getting my pc... however, a lot of that would be non game / non os related.
assuming you had a normal hdd that was at least 500 gigs, you should be good.