Sorry, I meant to say I have over 700 GB of free space. All the temp files were deleted recently. I had a different problem and someone from Dell went in my laptop and did all that stuff - cleaned it out. Deleted temp files etc.
Also, I recently backed up a lot of my files onto an external hard drive and deleted them on here. The laptop is fairly new (got it last November) and one of the best/most expensive I've ever had. I haven't had any other problems with it other than sometimes it suddenly decides that I can only use it if I touch the screen. Then I have to reboot and that fixes it. That was the error the Dell support person was trying to fix, but they weren't successful. It happens about once a month or so.
I've been using computers for 20+ years and haven't had to defrag in a long time. Windows does it for me. I've never had this problem before with Bitcomet. Why should I defrag etc. if Windows does it regularly automatically? That makes no sense.
No, I haven't been saving to an external drive. I always save to the same place.
My guess would be that there's some setting on Bitcomet that needs to be changed, or something on my computer is blocking it (possibly McAfee?) but it's just guesswork on my part.