There's another way to fix the startup issue, if that's what it is.
Open Regedit and drill down to:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Run

If you see BearShare in there, delete it.

Once that's out of the way hit control-alt-delete, go to the Processes tab,
right-click BearShare and select "End Process". BearStart should be able to
start it now, unless someone has set a policy blocking you from the date and
time entirely.

To remove that policy it's a lot easier if you are using XP Pro.
You didn't mention which version of XP you have there.