Windows 7 reporting incorrect hard drive free space! Any thoughts?

Partition Size (C:) : 215 GB
Windows 7 displays 6GB free space
When I select all the files including hidden files [Ctrl+A - properties] and check used space I see only 132GB is used!!
Clearly based on simple math I should have a lot more than 6GB free space!

I recently deleted a large number of big files.

What could be potentially causing this? Any fixes other than formatting the drive?
I used Disk Space fan to check the numbers and its giving me the same strange numbers

Note:
I emptied recycle bin and deleted temp files
rgu380Asked:
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JohnConnect With a Mentor Business Consultant (Owner)Commented:
Try a trial copy of TreeSize (Jam Software). This tool is very reliable and will tell you where the space is going. If it gives strange answers, then malware (as suggested above) is the likely culprit. ... Thinkpads_User
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artkairosCommented:
Could be a malware causing this. Run malwarebytes. www.malwarebytes.org
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Sekar ChinnakannuStaff EngineerCommented:
its a system protection of windows 7. by default it enabled on partition and it  set to max usage. It means system can use more space to create backup version of your files.
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copyrightedCommented:
Have you ran a chkdsk and defrag on the drive?  If you have done this in windows, consider booting into the recovery console and running 'chkdsk /f' from there.  Also, check the size of your system restore allocation (properties of my computer->System Protection) and make sure that is not set to allow use of too much space. (newb question, but did you empty the recycle bin?)
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rgu380Author Commented:
Thats right! I did get attacked by malware.Windows defender detected it.
I ran malwarebyte after that. But you are right this has happened since that attack.

I already ran malwarebytes once. Perhaps I should try again.
Thanks for the suggestion!

Any other ideas?
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rgu380Author Commented:
OMG! Thanks thinkpads user. Tree size detected a hidden folder called RRbackup. This folder is created by my thinkpad to back up my system. I did not know about this.

I deleted the folder to recover my space. And that program is awesome!!

Thanks a lot!
I also want to thank every one else who took the trouble to comment.
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JohnBusiness Consultant (Owner)Commented:
Thank you. I was pleased to assist and glad you found the backup folder. Lenovo machines like to do this. .... Thinkpads_User
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