1. Click the 'Start' button and type 'regedit' into the Search field, then click the 'Registry Editor' program.
2. Click 'HKEY_LOCAL_MACHINE' in the left pane of the Registry Editor window.

3. Click the 'File' menu and choose 'Load Hive.'
4. Browse to the secondary hard drive's 'windows\system32\config' directory from the 'Load Hive' dialog box.
5. Click to select the 'System' or 'Software' file (no file suffixes) to open the respective registry hives. Type a temporary name and click 'Open' to open the hive.
6. Click the 'File' menu and choose 'Unload Hive' when you have finished editing the registry hive on the secondary drive.