If at all possible upgrade the new computer from Vista to XP.
BearShare will detect Vista as an unknown Windows version and impose
limits designed for windows 98.

Right-click on both programs and set them to work in XP compatible mode
and with administrator permissions. Most people find this works.

You can also try the normal versions 5.1.0.27 and 5.1.0.28 and remove
the adware with the adware's own uninstaller program. The upgrade nags
never stop but neither will the program.