SEP causes high HDD activity

Hi there,

I'm having a problem on two WinXP Clients (32bit, SP3).

The problem is that everytime when new definitiona arrive the clients are nearly unusable because of a very high hdd activity. It takes abot 30 minutes!

In SEPM the option "scan at new definitions" is inactive.

I found out that the SYSTEM process causes the activities. In Properties of the process i can see that SRTSP.SYS causes the activities.

Can anybody help me to stop this hdd activities?!

Thanks

LeChuck