(Big) Problem with Audio Clock

I've got a big problem: Yesterday, I cleaned up my notebook by running some clean up-tools (defragmentation by Ashampoo WinOptimizer 2007, and the disc clean-up-tool, that is already installed on windows XP). Today, I wasn't able anymore to play my session in pro tools LE 7.0. I can open the session, and all sound files are still existing, but if I press play, i get a message, that pro tools is having problems with Audio Clock. I should check my clock source and sample rate. Untill now, I was never having some problems with that. If I start a new session, with new recordings, I don't have that problem. Only with the sessions that were already existing before yesterday. Can you help me? I would really appreciate it. My System: Dell Inspirion 6400, Core2Duo 2.0GHz, 2 GB RAM, M-Box 2.

dasrossischlos, Welcome to the DUC new poster.. Unfortunately, all of what my friend Shawn wrote above is the crude, sad and honest truth ! You never mess with audiofiles, there is a lot of info lying in the headers that some generic applications just won't understand and purge ! You do have a backup..yes ? Try opening a new session and import the data back. Also, re-check that your system runs on internal clock, at the rate the session was originally recorded at. good luck, a

Today, everything was running properly. My problem disappeared over night. I was really afraid when I read your postings today. But it was a lesson. Thank you very much for your advices. I thought, it would be good cleaning up the computer all few weeks.