you can go through the file explorer to program files and highlight and delete any programs listed. if there is still a non working link in your start menu, just go to file explorer > windows> start menu and find and delete the link from there. this isnt the cleanest or best way to free up memory though. id suggest looking in to a basic custom rom for your phone. you can find more info here folr more info on unlocking,
http://forum.ppcgeeks.com/showthread.php?t=93252
and here for a good basic rom for your phone.
http://forum.ppcgeeks.com/showthread.php?t=79579