It looks like CA PestPatrol might have a false positive, detecting SillyDl FFL in C:\windows\system32\wuauclt.exe. This is a component of Windows Update, and in the case of the false positive it is a 124,184 byte file with an internal version number of 126.96.36.1999.
PestPatrol does not appear to be trying to delete the file, it is merely blocking access to it. Updating your Windows Update components should clear the problem. CA usually fix these false positives in a day or so.
The current signature version is 2008.9.9.15. Note that the PestPatrol engine is used in some other products, not all of which have the CA name on them.