I have a Toshiba laptop with a 120GB hard drive. The O/S is Win XP and the processor is a Pentium dual core. It has 3GB of RAM. The problem is the hard drive is suddenly down to only 5% capacity. My wife mainly uses this machine and she finally mentioned numerous warnings appearing in re: hard drive capacity. I "unloaded" pictures and music from the hard drive and most of the programs that were infrequently used. That freed up absolutely minimal space on the HD. So, I ran Malwarebytes anti-malware (no issues), disk cleanup and I de-fragged the HD. It took almost four hours just to run MBAM in the "quick scan mode!" If I go to the control panel and look at "add/remove software," the biggest program is probably Office Standard 2003 with the Professional upgrade. Starry night Pro, Google Earth/Chrome, I-tunes, you name it, I've removed it. There is still only 6 GB of free space left on the HD. Now, I'm giving this puppy to my mother-in-law. I could delete every program except the O/S and re-load Office and whatever other minimilist program she may need. Would that help? What am I missing here in terms of why the HD remains mostly full?