Hello, I'm back. I have added those values to my registry, but this had changed nothing. This application works normally with other smaller databases and opens with no problems or errors. The database that displays the message, is 1.8 mlillion records, 500 MB. The CAT (COmputer Aided Translation) application is SDL Trados 2006. The same application + this confusing database on my laptop works properly and smoothly (still WIn2000PRo+SP4), no messages or something. Maybe I could compare some registry keys/values, export them from laptop registry and import them to PC registry? The only problem is that I'm not Windows registry expert Of course, I also notified Trados support, I did all they wrote me (only stupid things - not working at all), but still nothing. If you - Cluberti and Mr Snrub - could help me a lil bit, I can fix this problem without "format c:"? Thanks a lot for ypur help and looking forward for your posts. Grzegorz