Hard drive is decreasing in space at an alarming rate
So I was wondering if someone here could help me with a major problem I've been having. I own a Lenovo T61 cornerstone laptop with an intel core 2 duo and windows vista business. The computer came with about 70 GB of free hard drive space. I have downloaded some programs off the internet, but totaled, they could not have taken up more than about 20 GB. I also have quite a few music/image files, but they shouldn't be taking up more than 8 GB. That means I should have at least 42 GB space left on my hard drive. Yet, today I have about 2.8 GB. I've been monitoring my hard drive every day, and every day the hard drive space goes down by one GB. I've done everything I can think of to remedy the situation. Unfortunately, my knowledge of computers is such that the best I can do is do disk cleanup every day and defrag is once a week. I also have a fully functional virus protector, so I don't think that's it. Please, if anyone has any ideas, I'd really appreciate it. At this rate, I won't be able to even use the computer after tomorrow.