Alright, my computer sucks. It's a Compaq, I think like 4 gigs of memory. (I don't know much about computers, just enough to get by.) But it's slower'n hell, and it doesn't have much to it, so I want to see if I can clear the entire hard drive--wipe it clean--and load Windows back on it and start fresh from there. How would I go about doing that? Would I have to take it somewhere to get professionally done, or would I have to buy something to help with it, or could I do it with wha I have available, without spending any money? That'd be ideal.