My Videos Using up all my ram

running win7 pro 64bit, ive got 4gb or ram everything is fine on my system no problems at all never had a crash or anything.. rebuilt my rig in a new case and a new mobo reloaded win7 and has been working great for about 6 months now until recently when i open windows explorer and go into my videos my ram which normally runs around 17-20% usage gradually goes up and stays at 97-98% usage and will stay there for as long as my video folder is open.. ive left it open for 10+ mins then shut down from fear of over working the memory ive tried in my computer does the same... windows explorer works fine and does not show this problem its only happening when i open my videos folder any thoughts... just a side note i do have like 1tb plus of videos about 100gb or so on the primary boot drive and around a tb on a 2nd storage drive which appears in my videos threw a sub folder... ive been like this for years and never had a problem

infected videos i doubt i didnt really dl anything new when the problem started and how would an inproper codec hurt me im not tring to open a particular file... but tepid my first thought once i figured out the problem was maybe i dled a corrupt file and its causeing problems but really since its started i havent really dl anything new

explorer doesnt crash just eats up all the memory and i disabled the thumbnails thinking this was the problem and its still happening

tried both shark 007 and the clear cache neither worked i understand that it could be an infected or currupt codec but i didnt dl anything new to the computer when it started to happen... also in media center it brings up all the thumbnails no problem without any issues

alrite so i took all my movie files from the c:\ and transfered them onto my 2tb storage drive when i go into my computer and go to the 2tb drive its labels videos anyways when i go there no memory usage problems and the thumbnails are still generated in that folder still tho with an empty my videos folder it will still eat up all the ram... keep in mind the video folder on the 2tb drive has a shortcut in the my videos folder well i used to have it as a short cut but now on 7 ive had it include the folder in view...