I have a 250gb hard drive, essentially 160 though because the rest is on other partitions. Before running Defraggler I had 62 gb used, and 98gb free. Now after running it I have 52gb used and 108gb free. Is this supposed to happen.
I've had this computer for a year and a half, and only ran windows defrag 2 or 3 times. I'm a medium user, I use my computer a lot but usually just browse web. The last time I defraged was a few months ago, then used defraggler for the first time yesterday. I was browsing the web and saved 2 pictures yesterday while it was defragging. It's an emachines 250 netbook.
ok so now we seem to know that it was restore points, or at least I assume you were confirming and not just taking our suggestion as gospel, it seems what happened was during defrag your drive ran out of space and deleted restore points.