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I remember having about 84GBs before all this, but after system restore I only have 81GB left.
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What exactly is "before all this"? Minutes, hours, days? And what else did you do on your computer, starting 2 days ago from the restore point, until now, when you have 84Gb?
I am assuming you are talking about "free disk space", right? Assuming that is so, I am guessing you are wondering where the other 3 Gb of disk space went.
First, I don't see that as a lot. But second, it is very likely when your system crashed, all kinds of open files were left open, resulting in lost clusters on the drive. Some of those files then had to be re-created upon boot (for Windows) and upon loading and/or starting of programs (firewall, AS/AV, and whatever you have starting at boot.
I would run Disk Cleanup on your drive(s). Then chkdsk. Chkdsk is a command-line (DOS prompt) tool within Windows that checks disk volumes for errors. If run with the proper switch, it will also attempt to repair errors it finds. Chkdsk can repair bad sectors, lost clusters, cross-linked files, and directory errors. To use chkdsk, you must be logged on as an administrator, or be in the administrators group.
1. Click Start, and then Run.
2. In the 'Open' text box, enter cmd, then press Enter.
3. At the command prompt, enter chkdsk [drive]: /r (note the space before the "/r" and be sure to replace [drive] with the applicable drive letter). Press Enter to start.
Note: If chkdsk finds files in use (and it probably will), you will receive the following message:Chkdsk cannot run because the volume is in use by another process. Would you like to schedule this volume to be checked the next time the system restarts? (Y/N)
Press Y then press Enter to allow chkdsk to run at next bootup, then reboot.
Note: You will see many folks suggest using the /f switch instead of /r. The /r switch is often considered better because it also instructs chkdsk to search for and attempt to repair bad sectors. /r includes /f. To see the switch descriptions, enter
chkdsk /? at that command prompt, and press
Enter.