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.htmTake care
SiRu