Are you looking for a key named InDesign, or subkeys, or data that refers to ID? I have tons of references to ID in the Classes subkey.
Are you uisng the Find facility under the edit menu?
the only relevant or seemingly important key i've found is InDesign.Application and InDesign.Application.CS5. But I can't figure out why there is no InDesign key in HKEY_LOCAL_MACHINE under SOFTWARE, as EACH software i have installed has its key here. I had ID on my previous computer with WINDOWS 7 32bit, and in HKEY_LOCAL_MACHINE there were all respective keys of the applications from CS5 i had installed. maybe Windows 7 64bit version manages keys in a different way
today again when i opened ID it behaved strangely. no toolbars, no layout and when i clicked on the hidden toolbar only then it showed up and ID gave a message that programm stopped working and will be closed... and really - it was closed
The key is located in this format of tree within regedit: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Adobe\InDesign\7.0\ for your CS5 copy of InDesign. In future you can use the F3 key in regedit to find any key that you want to.
i did use F3, but maybe i didnt notice it... anyway, if this placement of ID is OK, then it should be OK even on my computer.