Follow the link below and download Process Explorer by Mark Russinovich of System Internals.
He has been writing tools for Windows for years.
Be sure that you download the proper file for YOUR Operating System (which you seem to have felt was not important enough to mention). If you get a message about missing symbols just ignore it as it is not important for your purposes. You can right click on the column headings and add additional info columns for viewing.
Does anyone know of a good (and inexpensive) utility that can tell you what programs are running on your PC and what they do? I'm so tired of seeing all these random files that I suspect of being malicious, without really knowing for sure. I have Webroot Spy Sweeper and SpyBot S&D but there are still things that are running on my system that I'd like to know about.