I posted this recently in Annoyances.org and only 1 user pointed it out that it had something to do with MSN Messenger.
You guys are talking about the key only in
HKEY_CURRENT_USER
I found the key also in
HKEY_USERS\S-1-5-21-1202660629-1580436667-854245398-500
My folders were:
S>P>3256059692
Inside which there are two
REG_DWORDs which you guys have already mentioned:
The first one is called:
MsgPrivacy: On clicking Modify you get Value Data = 1 and
on clicking Modify Binary Data you get 0000 01 00 00 00 ....
and the second one is
Prompt: On clicking Modify you get Value Data = 0 and
on clicking Modify Binary Data you get 0000 00 00 00 00 ....
So as all of you mention this has something to do with the msngr program and I think that's true bcos I got worried about the folders and ran SuperantiSpyware and Malwarebytes and they did not come up with anything or deleted the folders.
So just relax these are harmless folders and the last folder comes up with different nos. for different comps.... as some of u are saying that it is a UNIX timestamp.

don't know whether that's right.