Hello, welcome to SpywareHammer.
I go by Hoov, and I will be helping you with your problem. I must ask you to do a few things for me.
First, tell me everything that you have done, if anything, to try and fix this problem.
Second, please only use 1 forum to help clear up your problem. Posting on more than 1 and following instructions from more than 1 forum will cause those helping you to pull out thier hair.
Third, follow my instructions - If you can't for some reason, or if you don't understand something, please tell me. If you deviate from my instructions, tell me, it may make a difference on where we go.
Fourth, Have faith. I will do all I can to get your computer working, and if I can't - someone else here will know something else to try.
Before we get into fixing your computer, I need to know, do you have your Vista install DVD? Also do you have access to another computer that you can download files and burn to a CD?