Selling PC, How to Clean User info from the registry?

[Quadzilla]

Hi All.
A friend is trying to sell a Gateway DX4870 PC and she asked that I move all her pics, music etc. to a portable HD. I want to wipe her personal data from the PC's HD and reinstall Win 7 but she doesn't have the original Win 7 discs that came w/the PC. Ive removed all her docs, pics etc., uninstalled most non-MS programs and removed her User ID but how can I make sure all her personal data is gone? When I search the family's name in regedit I get quite a few hits especially in keys similar to this:
HKEY_LOCAL_MACHINE-SOFTWARE\Microsoft\Windows\CurrentVersion-Installer-UserData-S-1-5-18-Products\4EA42A62D9304AC4784BF2381208770F\InstallProperties

Thing is, when I run Ccleaner registry cleaner I don’t see those keys at all. Are there any other tools that clean user info from the registry? Thanks.

 

[ThrashZone]

Hi,
See if this works out,
http://www.sevenforums.com/tutorials/197255-windows-7-installation-prepare-pc-sold.html

 

[Magnakai]

Are you able to remove the harddisk and connect it externally to another pc? then just format & wipe it; i recommend EaseUS Partition Master or Acronis