cleanmgr.exe (Disk Space Cleanup Manager) Is a tool (application) that is found on all major operating systems Windows Microsoft (inclusive Windows Vista si Windows 7). In the Windows Task Manager, Not to see this process running his own. May be released to you (voluntarily) from Run box, Or ask to be released when space on your system partition (Hard disk) is insufficient for the operating system to run in normal conditions.
This is what happens when space on partition C: (Which is installed Windows XP) is insufficient ...
"Low Disk Space - You are running very low on disk space on Local Disk (C :). To free space on this drive by deleting old unnecessary filesClick here.... "
Here come into play cleanmgr.exe. Once launched, it will scan and search for files that can be deleted from the system partition.
After completing the scanning process, a box with two tabs will open. In the first tab (Disk Cleanup), you have the option to delete files from the disk (such as: Temporary Files, Recycle Bin, Temporary Internet Files… etc).
After selecting files, click OK to begin the cleaning process.
If any of these files does not solve the problem delete the partition space in the tab "More Options", you can remove components of Windowsacquis, installed programs or points restore (restore point - how to).
Until you eliminate components of Windows, first try to remove the programs installed by you. Programs that occupy a lot of hard disk space, and which you can miss without affecting your computer activity.