[Mobhack]

First thing that comes to mind is that your sound card may be having problems?.

Try switching the sound off
- turn mouse interface click to OFF in the game options programme
- when in the game, go to preferences screen and ensure both sound settings are OFF.

Then try the game again.

Also - I would do a complete check of the hard drive, as many Windows oddities can arise from a disk that has not been defragged fo a while (Only do a surface sector scan if you have overnight to run the job, I only do that one once a year or so).

Cheers
Andy