Quite often, it's faster to re-install Windows and everything, than to mess with various corrective measures for days. And, the only true way to get rid of a serious virus or other malware attack is to wipe the disk totally clean - clean as it was at the factory. A mere re-installation of Windows may not fix all bugs you have.
Low level formatting is the only option I truly trust, in case of a disaster. If I have the correct picture, deleting the partition with a program like GParted, does the job. Another option is to get disk tools from your disk manufacturer, and do it from there.
If you decide to wipe the disk clean, it wouldn't be a bad option to have an expert do it. It won't be that expensive, and in case you have, say, a laptop with a system partition, meaning you don't have a physical DVD, it would be a safe alternative.
This is a bit of an Armageddon picture, let's hope easier methods are adequate. Best wishes, good luck.