I can't get rid of this malware virus! tried and tried again.....what should I do?

I am very very very frustrated here! I can't seem to get rid of adware viruses off my computer no matter how hard I tried. I've scaned my computer with AVG, I've tried Super AnitSpywere Free Edition, I've tried Adaware, I've tried Malwarebyetes, I've tried PC clean....all of these wouldn't get rid of the specific virus. I've tried Spweredoc, but it found a lot of viruses but I can't get rid of them without purchasing the program. I have no job, and no money and cannot afford to purchase anything. I've tried installing Hijack this but it wouldn't install because it said, Failed to Connect to Server. My computer constantly crashes, runs slow sometimes, browsing the internet is frustrating...and I cannot seem to get rid of this no matter how hard I try. What are some other options. Please don't tell me to download the fallowing programs: superanispywhere, ad-aware, hijackthis, pcclean, and Malware bytes because I already used them! What are some other options other then purchase programs that cost money or reformatting my hardrive?