The last week (for no apparent reason), my daily pull (HTTP) from McAfee failed with this message:
Failed to validate repository McAfeeHttp. File C:\WINDOWS\TEMP\naiAF.tmp\00000001\avvdat.ini
(although the file listed may change. sometimes it's the \gdeltaavv.ini as well)
I'm on EPO 4.5.0 build 937
The only "Fix" (I've had to do this every day now) is to delete the current.dat and then re-run the task and then it'll work until the next time it runs.