Stuttering and unrendered playback -

TO anyone who has ever had this happen or knows anything about this please help. Ever since I installed mainconcept on premiere cs3 - all my already rendered footage became unrendered again. Although it plays fine. When I render it, it just seems to play very stuttery - almost in an old fashioned film look - fast motion. I have tried uninstalling main concept - which it wont let me cause it cant find install.log file. Also tried re-installing premiere - updating graphics drivers - nothing seems to work yet. Might try re-installing a different version of mainconcept - see if that works. If anyone knows anything - little or large - please let me know - there's a feature at hand here - hehe.
-Glenn
www.darkepic.net