Note:Learn to Backup Registry Before Editing.

On an NTFS partition, Disk Cleanup can compress old files to save space. But calculating the savings and performing the compression often take a long time, and on some systems, Disk Cleanup hangs during the process. If that happens, or if you don’t care to wait,
use this Registry tweak to disable the compression Delete the key

HKEY_ LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\VolumeCaches
\Compress Old Files

To change Windows Owner Name edit the Windows Registry:

1. Click the Start button then Click Run. Type regedit in the blank, and then click OK.

2. Then go to
HKEY_LOCAL_MACHINE > Software > Windows NT

3. Click the CurrentVersion registry key.

4. In the right window pane, double-click the RegisteredOwner

5. Then Edit RegisteredOwner to change the name of the owner.

you can change the default installation drive and/ or directory by using a Registry hack.

Go to:

1.Start > Run

Type regedit
Go to this directory…
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion

3. Look for the value named ProgramFilesDir. by default,this value will be C:\Program Files. Edit the value to any valid drive or folder and XP will use that new location as the default installation directory for new programs.