Scootinboots

Hi, I just joined because I'm hopeful that somebody might have some insight into this problem I'm having. About a week ago I borrowed a friends portable HD and got some files off of it. About a day after I started getting messages saying my hard drive was totally full. It really didn't make sense because the partition windows is on is 60 gigs and I keep most everything else installed on the other partition (except for a few games like steam). I looked around the drive and found that my windows folder was taking up 35 gigs of space which really made no sense. I tried disk clean up but it failed because there was less than 200mb free. so I moved 3gigs worth of folders off the C partition and tried again. Same problem with there not being enough space. I looked at my windows folder again and it had expanded to fill the space I freed and was now 38 gigs. I really have no idea whats going on, I started the computer in safe mode and the folder went back to its normal size. After I went back to a normal boot it was fine for about 5 days and its started all over again. I tried to start in safe mode again but now even in safe mode the whole drive is filled. Any help would be much appreciated. Thanks

I'm new here of course and I'm hoping that you all on here are able to help me with any issues I come across. But that aside I'd just like to say hello.