adobe preimer question

[Cliff13]

http://img158.imageshack.us/img158/2393/videoproblembe4.jpg
For some reason i keep geting this message, any ideas?

[BigMike]

Have you saved the project and restarted the program? check that your scratch disks are all connected and configured. if all else fails, restart the computer. If that doesn't work....... I got nothin

[Cliff13]

Whats a scratch disk? Iv tryed restarting a few times.