[header] How to install windows 7 on the same hard drive as windows vista [title] Buy or download windows 7 [title] Within windows vista follow these commands. [step] Start, control panel, administrative tools, computer management, storage then disk management. [title] Its now time to partition your hard drive. 
[step] To do so, right click on your current hard drive where vista is installed (for most people it should be the " c " drive). [title] Click on shrink volume from the drop down menu (shrink volume determines the maximum disk space that is allowed for partitioning) this may take a minute or 2.