malware attack

lol i give up i think ima just uhh save all my good stuff (that i have viris scanned) and re format my computer, nothing is working, i think my computer ^%&^&%$ itself

aww, tryed all but as soon as the scanning program finishes, it closes down b4 i can save anything

ohh and btw, i cannot save things to my desktop so i dont know how to get around this, in all the instructions it says save to desktop, is this realy needed or can som1 write a new step by step for me (remember i have to transfer all files first)

umm, ok i have recentley notcied my computer redirects me to sites i am not going to (i.e i type in hello and it redirects me to "buy anti viris softwear") anyways i downloaded MBAM and updated it, but soon after i ran the scan it closes down and i if i click it again i get "windows cannot access the specified device, path, or file. you may not have the appropriate permissions to access this item." anyways i figuired it was just dandom so i re downloaded it, and again, and again, untill i went and downloaded avg free, its scan found "virises" but when i clicked delete it closed down the softwear. anyways im realy frustrated and i dont know what to do because now my computer wont let me download ANYTHING!?!, i click run or save but nothing works, im affraid it will get worse and worse. anyways i figuired, cuz i have 2 comps, u can tell me what to download and ill exchange it over using a usb or sumthin, maby even email. if you could help me that could be great. and btw my computer is running vista, i have never had any problems b4, plz help thx in advance