I have had a few friends have this problem even with the popularity of PT8. Their PT LE 7.4.2 system starts crashing with low track counts and low plug-in counts when it used to run perfectly. You will inevitably try a million HW setting to try to get this to go away with no luck. The simple solution is you need to uninstall and reinstall PT LE and you will have a working system again. Make sure you also install the latest CS update as well.