So I have an Acer Aspire 5250. It used to be blazing fast and good for the price but some of they keys fell of and got lost. So we sent it back and they gave us a refurbished one but now thing thing is hella slow takes forever to load pages.. Freezes easily.. Can't watch any videos in fullscreen or in HD without lag and I used to be able to do that all easily even play minecraft on low settings fine. I reinstalled Windows 7 and that didn't help either. Any idea what it could be? I am guessing its a component is it the HDD or what is a very slow system a sign of? the HDD is 500GB and it has 4gb of ram and AMD Radeon HD 6320 Graphics along with a dual core CPU.