Corrupt database using tasks

We have one user, using tasks very heavy, and he gets a corrupted databaser once a week. We can solve this problem with a fixup, but we would like to turn off the reason.

200 other user don’t have this problem.

The message appears (in German): Datenbank beschädigt - Platz kann nicht zugeteilt werden.

what can we do ?

Dominio 6.5.5 runs on W2000 SP4 server with 2 GB RAM

The user has an Notebook IBM Thinkpad R52 with 1 GB RAM