setifaceUpdatePackages Warning & No Scheduled Scans

I installed AVAST 4.7 PRO on a Win98SE system a few weeks ago. It seems to have been running ok, except the weekly scan I scheduled never runs. Manual scans have run ok. Then today I looked in the Warning log & found this:

2/9/2008 10:51:32 AM 4294845497 Function setifaceUpdatePackages() has failed. Return code is 0xFFFFFFFF, dwRes is FFFFFFFF.
2/13/2008 11:21:48 AM 4294876687 Function setifaceUpdatePackages() has failed. Return code is 0xFFFFFFFF, dwRes is FFFFFFFF.
2/14/2008 2:42:29 PM DMorgen 4294876605 Function setifaceUpdatePackages() has failed. Return code is 0xFFFFFFFF, dwRes is FFFFFFFF.
2/17/2008 8:54:45 AM DMorgen 4294870825 Function setifaceUpdatePackages() has failed. Return code is 0xFFFFFFFF, dwRes is FFFFFFFF.

Do you have any idea what this warning means, and why the scheduled scan never happens?

Thanks.

Dave

Can anybody help?

Thanks.

Dave