When your computer's hard disk drive is nearly out of free space, Windows Vista will warn you with a little pop-up box at regular intervals. This Low disk space warning can be handy the first time but that's usually where the usefulness stops.Aside from being annoying, Windows Vista's constant check for low drive space uses system resources which can slow Windows down.
Follow the easy steps to turn off the low disk space checks in Windows Vista.
Click on Windows Vista Start, type in regedit in the start menu search box, and then hit the Enter key.This command will load the Windows Registry Editor program.
Locate the HKEY_CURRENT_USER folder under Computer in the Windows Registry editor and navigate to the key, HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion.
Select the Policies key under CurrentVersion.
From the Windows Registry Editor menu, choose Edit-> New-> Key.
After the new key is created beneath Policies key, it will initially be named as New Key #1.
Change the name of the newly created registry key to Explorer and then hitting the Enter key.
With the newly created registry key, Explorer, still selected, choose Edit -> New-> DWORD (32-bit) Value.
After the new DWORD value is created beneath Explorer, it will initially be named New Value #1.Change the name of the newly created DWORD value to NoLowDiskSpaceChecks and then hitting the Enter key.
Right-click on the newly created NoLowDiskSpaceChecks DWORD value and choose the option Modify.
Change the value of DWORD, 0 with the number 1.
Click OK and close Windows Vista Registry Editor.A reboot is needed to take effect the registry changes.
Windows Vista will no longer warn you about low disk space on any of your hard drives.If you don’t have a lot of free space left on your computer hard disk drive, you might be able to get more free space by running the Windows Disk Cleanup Wizard. You can get Disk Cleanup Wizard from Start -> Computer -> Right-Click on the hard drive -> Properties. Check all of the boxes except Compress old files option. You may also want to delete some System Restore files to recover a lot of free space. You can accomplish this option in the More Options tab.
Note that it is better to create a registry backup before the windows registry tweaks,because if any stability problem occurs restore the registry back.So it is a good practice to all,working with windows registry.