[NetCline]

I always find the best thing to do is reformat then reload your OS and then PT. If it works after that start adding the extra programs you run, testing each time after you load one. this will track down a culprit conflict. Or....go back through your notes..If you take notes on things you do to your computer, and check on the last few things you did or loaded and reverse the process. I am going to state the simple here and suggest checking the DMA on the hard drive. Check the device manager and performance tab and make sure there are none of those pesky yellow !!!!! and the performance is not in compatability mode. This is all conflict type stuff and can be troubleshot if you can isolate the culprit. See first comment.
Just my experience hope it helps.
Try to remember if you did anything recently to change your computer NO MATTER HOW SMALL and reverse it. believe me I have had little things cause big problems.

Jeff