I get from that that the program should change the clock back. Here's what pops up when I click on BearStart:

"This little utility will set the date to July 1st, 2005 start the installed version of BearShare, pause 10 seconds, and then put the date back to today."

When I press OK to continue, it still says "Key Expired: this copy of BearShare has expired." I am working on a laptop, and I can't change the date on my system manually because I apparently "do not have the authority."