Ytunnel has stopped alot of boots for peeps but it also has ate some versions of windows (mainly XP). I would suggest not installing YTunnel on your system unless you have good backups and can easily reinstall. The programmer for YTunnel needs to head back to school because his registry settings are sure to hose some systems winsocks!
Dont leave your troubles up to some 3rd party Application builder that doesnt know how to program well.

Best of luck to YTunnel users.