Whats Up With My Software?????????, software start-up problem!!!! HELP!!!! Options

[sirchit]

hi folks, i have one hell of a problem.
i use logic platinum pro and love it dearly. everything was going great untill the other day. i tried to start up my software and a message reading "the application logic pro has unexpectedly quit. the system and other applications have not been affected." appeared. unfortunatly i do not understand why this is happening. iam in no way a computer tech and cannot resolve this problem. i love using logic and i would say im very good with it, but i cant get my head around this. i recently installed a free native instrument called "future loops beat rompler" which came with a future music (and can i say, what a great magazine it is) onto my system and its never worked properly since i installed it, well i think it was this. now, you would think that this was the problem, and it probably is the problem. for the life of me i have tried to find a function on my mac that allows me to to un-install this peice of software from my comp. but i cant. i can delete some of the files associated with this instrument but before i get the statement "the application logic pro has unexpectedly quit." i get a message- "(future loops) your serial number is not correct. please run the registration tool to enter the correct serial number for future loops.". i do not want to run the registration tool and i have removed all files know to me (i think) associated with this instrument. now, for some reason logic still thinks that the software is still in-stalled on my comp???????? maybe there are some remaining files left some where, but for the life of me i cant find them!!!! is there anyone out there who could tell me how to get rid of the situation iam faced with. as i said before i love my logic platinum pro (its a legitamate version i must state) and i cant live without it. im missing it dearly and may cry if i cannot bring it back to life!!!!! boo hoo!!!!!! oh crap i did cry!!!!
iam using a g4 power mac with dual 1.25 ghz processors, 1024 mb of ram and my operating system is mac osx 10.2.8 .

i dont know if this could be a problem also.........
my main hard drive on my comp is almost full, and when i say almost full i mean extremely almost full!!! i also have an external hard drive made by "carillion" its a fire wire connection from the comp to the drive and it has lots of space left. 108.47 gb to be exact. could the main hard-drive being almost full be the problem??????

or do i have a virus?????? i dont know, as i stated earlier iam in no way a comp tech and i really need to know if i have a virus. are there any free virus scanners out there for me to download???? or will i have to bite the bullet and purchase something like "norton anti-virus"? will this get rid of what i may have?? if, i have anything at all. or maybe there is an application already in-stalled on my comp that can help me battle this little blighter???

if you are a samaritan and would love to help me, the poor wounded one called chris. i would love you forever. and if there was anything i could do for you (of course, keeping it above board!!!!! lol!!!) (im being serious dudes and dudettes) i will be here for you.

please please please help me obi-wan your my only hope


take care of yourselves and maybe ill hear from some-one very soon. x