Disk space being gobbled up mysteriously

I noticed two weeks ago that I had over 50% of the partition was free. Yesterday I had 4GB free.
I didn't have time to investigate so yesterday I removed the second partition and expand the first one. So now I have 250 GB free. Today I discovered that I had only 119GB free.

I currently have Superantispyware, Malwarebytes, AVAST and ZoneAlarm. The scanners are finding some things but nothing big.

Any suggestions or comments are greatly appreciated!
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Elton BrownAsked:
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tailoreddigitalCommented:
Download Foldersize, have it scan the drive.   It'll list whatever is using the most space and that'll be your clue to what the culprit is.   Once it finishes the scan, sort it by the size column.

http://www.mindgems.com/products/Folder-Size/Folder-Size-Download.htm
DeadmanIT ConsultantCommented:
Scan with TreeSize tool. Inspect where space has consumed. And also there are a number of system files which take a lot of space. Some of these are. These are normally marked as Hidden and System.

1. Page File
2. Hibernation file
3. Filesystem metadata files.
4. Windows shadow storage.

To Free Up and Recover Hard Drive Space
andreasSystem AdminCommented:
Scan with Scanner tool. It will show biggest folders in a pie chart.

http://www.steffengerlach.de/freeware/ Its portable and does not need to be installed.

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nobusCommented:
it looks like you are making a backup to your disk - check if it set to another drive, or external one
Elton BrownAuthor Commented:
Thank you Andreas for your suggestion!
I am trying your Scanner tool right now.
I will let you know what I discover.
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