resetting expire date

Any chance I can trick the computer into thinking my demo game did not expire? I tried checking the install log and deleting registry keys and turning off my system restore and the obvious of uninstalling and then deleting all stuff by game name and pub/dev names. I also did the same with those names in as many places in the registry I could find as well as in Documents and Settings in WinXP. I really don't want to DL a crack, but thought I'd check here for any tricks I'm missing. The game is Elf Bowling Holiday Pack and it keeps the time played and subtracts each time you play until you use up the full 60 minutes of demo time. Either it's impossible or I'm missing some interesting trick. Let me know one way or the other either in here or by e-mail. Thanks.