One thing to try, move the BearShare program folder to recycle bin & empty. Use both of these programs to clean up the system: (1) Crap Cleaner, & also (2) Microsoft Windows Install Clean Up

If you wish to continue using BearShare, I recommend the version Aaron suggested (v.5 beta). It was their best version. The present Bearshare versions have limitations on what you can download with them since now it's a different company that owns it with different programmers & different objectives.