User Assist Keys

Hmm, what does this do?

user assist keys

Update:

Windows Explorer keeps track of the programs you run in the UserAssist registry keys, which are ROT13 encrypted. Some people say this is spyware behavior of Windows.
This program will display the decrypted entries and allow you to delete them. I've also reverse-engineered the binary data stored in the entries: it's a counter and a timestamp.

Download here