Adjusting the time and date is what it does whilst it starts up, but it should only last for a few seconds then return to normal time. You mean your time is not changing back even after some minutes?

Which Windows operating system version do you use?

If you are using Windows 7, try changing BearShare to Run in XP mode and run as administrator.

A clean install is where you uninstall the previous installation and remove all folders belonging to the program including the preferences folder.