Running a bit low on diskspace or want to speed up your PC a bit more? Since the introduction of Windows Side-by-side you can run stuff with backwards compatibility but this comes at a tollyour disk.
If you have windows Vista installed you do the following; Hit the start button, type in “CMD” and right-click the icon that appears in your start menu. Click “Run as Administrator” (or “Als administrator uitvoeren” in dutch). A small black window pops up. Here you type in compcln. Confirm you’re okay with it and voilá. Free up aditional disk-space!