Program - deleting info so can re-install program? : SWG Premium Discussions

hi.
can someone please explain how to delete the SWG (registery?) code from a computer once you have installed the main swg game in order to install a different trial version? i tried installing to a different drive and it would not work. i also tried removing the main game and trying to install the trial and it wont work.
apparently SOE puts some hidden info in there so you cant keep installing trials, but i want to do this hehe.
the only way i know how to do this is to buy another HD but i am hoping you guys might know a more affordable method!
thank you!

use
station launcher
then
create a free station account
use as a free trial acc
i have 300+ free trial acc
for gift rewards ect

Thank you!