Not sure where to post this, so I’ll post it here. I’m on windows 7 32-bit on Macbook Pro. Basically, my hard drive space keeps increasing and decreasing. Basically, everytime I check, it goes something like this: 7.10 GB—>7.10 GB—>7.08 GB. It goes at a rather fast rate. It drops to somewhere around 6 GB, then it starts increasing again. The only think I could think of is trying to uninstall the far cry demo. I was trying to delete it, and it said it couldn’t be completed because it was open in “farcry_demo” or something like that. So, I opened it and tried to follow the path, but it was in hidden files, so I didn’t bother. I clicked “unzip” (as that was required to run setup.exe" and half-way through, I canceled it. I checked, and saw that my space was decreasing more and more everytime I checked. So, I shut down my computer, turned it on again, and see my space got back to what I assume is it’s capacity it had. I deleted far_cry.msi in the temp folder in appdata, I think, and I could delete the game, finally. That didn’t fix it though. One thing I tried doing is running CCleaner, but I didn’t analyze. I also tried deleting my whole TEMP folder, but there was one file that windows said I have to verify or something. It was FXSAPIDDebugLogFile.txt. Thus, I left it alone. Any idea on what’s going on and how to fix it?
Scan for viruses.
About 3 hours later, it stopped, thankfully. End result, 9.80 GB. I would still really want to know what was going on though…I hope it wasn’t a virus.
The only reason I could think of would be that you have your hard drive to auto-defrag at a specific time and or certain day of the week.
That also happens when your hard drive defrags, the space available would decrease and then a sudden increase at the end.
It also automatically makes backups of some stuff for system restore. In disk cleanup, you can tell it to delete all the system restores except the last one to clear up some space.
Also, don’t worry about it… or get a bigger hard drive 
i think 7 defrags every wednesday by default
after a while all of your files will be already perfectly defragged so it won’t have to do much
That makes sense. I wish I could increase the space, but i have bootcamp, so apparently, I have to re-install it to increase it, and I don’t quite know how to do that. Thanks for the explanation, guys.
Not exactly on topic, but you might be able to save a couple of GB’s with this:
https://blogs.technet.com/b/joscon/archive/2011/02/15/how-to-reclaim-space-after-applying-service-pack-1.aspx
basically:
open a command prompt with right-click->Run as administrator
C:>dism /online /cleanup-image /spsuperseded
This will make the SP1 update permanent, which means it can’t be reverted, which has the effect of clearing up at least 3 GB’s of space on the system.
That is, if your bootcamp install has the SP1 update installed…