i agree about spybot search and destroy. also try one called Ad-aware. both programs work great. I work on alot of computers. and these are the programs that I always use
If you cant download from that computer, see if you can get on a different computer. Then when you are downloading the file, instead of clicking "run". click "save" and save the executable file to a flash drive or burn it to a CD. Then you will be able to load that on your computer.