I don't know why, but my computer lowered it's space from 20.1 GB free to 15.1 free in 2 days. I didn't download anything at all, just let my friend play a FPS on my computer (already installed and no patches came out that day) called A.V.A. by Ijji. I know it's a safe game without viruses, so I know it's not the problem. I recently ran defraggler, about 2 weeks ago and it cleared 10 gb off my hard drive, so I was like "alright!" I then installed A.V.A. and ended with with I think about 22 GB free. I ran defraggler again to hopefully get even more space, but it ended up ACTUALLY TAKING up space. After that my hard disk space has randomly gone down.

Additional Details
I have Windows Vista Home Premium and my Malwarebytes said nothing was found and I stopped Nod32 halfway since nothing showed up too and I was tired of waiting.

My computer space after virus scanning is 14.9 GB. It just went down some more.

I system restored my computer to 11/30 and it went to 14.2 GB, then uninstalled a few things to make it 14.8 GB. Now it just randomly dropped to 14.5 GB. What's happening?


Update #1
My space has now gone down to 12.8 GB. What's happening??robles56,
You should already know that we need more information.
What make of PC do you have.
Which OS do you have.
Name all AV software you are using.
Is your PC always on-line?
Are you using lime wire or other P2P?
What is the size of your disk drive?
Why not GIT a BIGGER Drive? No, that is not a joke. Having only 12 GB spare is small  by current standards. Except for a net book.
I suspect below said could be the issue 
*******************************

ISSUE : Hard Disk space is getting reduced on a daily basis in Windows Vista
 
CAUSE: The disk space is used by the System Restore points to store the data.

RESOLUTION:

Disable the System Restore temporarily to get the lost Hard disk space back. On doing that, the System Restore points already created will be lost. To prevent this from happening again, reduce the size of disk space used by the System Restore points. To do that, type the following command at the command prompt:

vssadmin Resize ShadowStorage /For=C: /On=C: /Maxsize=3GB

In the above command, 3GB refers to the size used by the Restore point. We can change it accordingly.

************************************************************************************

OR

Please disable the System Restore temporarily to get the lost Hard disk space back. On doing that, the System Restore points already created will be lost. To prevent this from happening again, reduce the size of disk space used by the System Restore points. To do that, type the following command at the command prompt:
 
1. Click Start
2. From the Start menu Click All programs followed by Accessories
3. On the Accessories menu Right Click on the Command Prompt option
4. From the drop Down menu that appears, click the Run as administrator option
5. When the Command Prompt window opens type
vssadmin Resize ShadowStorage /For=C: /On=C: /Maxsize=3GB
 
In the above command, 3GB refers to the size used by the Restore point. We can change it accordingly. If all goes well you should see a message saying 'Successfully resized the shadow copy storage association". Your System Restore shadow storage has now been resized. This will solve the issue for sure.
 
Please refer the web links provided below to find out why this issue is happening and how to solve it:
 
http://vistahelp.blogspot.com/2007/08/how-to-reduce-disk-space-used-by-system.html
 
http://www.watchingthenet.com/how-to-reduce-disk-space-used-by-windows-vista-system-restore.html
 
http://www.petri.co.il/using_backup_status_and_configuration_in_vista.htm

Take care

SiRu

"robles56,
You should already know that we need more information.
What make of PC do you have. I don't know what you mean, but my computer is a Vostro 200 by dell
Which OS do you have. Windows Vista
Name all AV software you are using. MBAM (free one), Nod32 2.7 (guy who fixed up my computer last time for a better video card put it for me for free)
Is your PC always on-line? Yes, I always have internet on.
Are you using lime wire or other P2P? No, I download any P2P thing except ONE file, Fraps, a recorder for video games, which my friend also downloaded and has no problems.
What is the size of your disk drive? 74.4 GB
Why not git a bigger Drive? No, that is not a joke. Having only 12 GB spare is small  by current standards. Except for a net book." I'm considering custom building a new pc later, but for now I really need this computer.

Thanks.





I checked that i have used up (checking all my c: files, and added them up) comes up as 50.25 GB used up (my own calculations, clicking on properties on every
folder in C:), and the computer says there are 59.9 GB used. That's about 9.60 GB used that doesn't show up in my calculations, which I'm sure are accurate. Why is this happening? Quote from: Sykes on December 06, 2010, 11:53:04 PM

I suspect below said could be the issue 
*******************************

ISSUE : Hard Disk space is getting reduced on a daily basis in Windows Vista
 
CAUSE: The disk space is used by the System Restore points to store the data.

RESOLUTION:

Disable the System Restore temporarily to get the lost Hard disk space back. On doing that, the System Restore points already created will be lost. To prevent this from happening again, reduce the size of disk space used by the System Restore points. To do that, type the following command at the command prompt:

vssadmin Resize ShadowStorage /For=C: /On=C: /Maxsize=3GB

In the above command, 3GB refers to the size used by the Restore point. We can change it accordingly.

************************************************************************************

OR

Please disable the System Restore temporarily to get the lost Hard disk space back. On doing that, the System Restore points already created will be lost. To prevent this from happening again, reduce the size of disk space used by the System Restore points. To do that, type the following command at the command prompt:
 
1. Click Start
2. From the Start menu Click All programs followed by Accessories
3. On the Accessories menu Right Click on the Command Prompt option
4. From the drop Down menu that appears, click the Run as administrator option
5. When the Command Prompt window opens type
vssadmin Resize ShadowStorage /For=C: /On=C: /Maxsize=3GB
 
In the above command, 3GB refers to the size used by the Restore point. We can change it accordingly. If all goes well you should see a message saying 'Successfully resized the shadow copy storage association". Your System Restore shadow storage has now been resized. This will solve the issue for sure.
 
Please refer the web links provided below to find out why this issue is happening and how to solve it:
 
http://vistahelp.blogspot.com/2007/08/how-to-reduce-disk-space-used-by-system.html
 
http://www.watchingthenet.com/how-to-reduce-disk-space-used-by-windows-vista-system-restore.html
 
http://www.petri.co.il/using_backup_status_and_configuration_in_vista.htm

Take care

SiRu