I guess for me this is solved.
It got worse today. My PC started up, and just by chance I went to look in the event log to see how things were going on. I keep an eye on it from time to time.
There were 3 error events in there telling me that:
event 7034 - "The BullGuard Email Monitoring Service service terminated unexpectedly. It has done this 1 time(s)."
event 7034 - "The BullGuard File Scan Service service terminated unexpectedly. It has done this 1 time(s)."
event 7034 - "The BullGuard Main Service service terminated unexpectedly. It has done this 1 time(s)."
I went off to the eircar test file (which was being detected by BG OK yesterday) and sure as eggs is eggs, it now wasn't. I could open it, rename it, anything.
I waited. Neither W7 or Bullguard bothered to tell me that most of BGs services were not running.
After about 5 mins I manually scan'd the file and BG detected eircar test. At this point up popped some error messages from BG telling me that things like the email scanner was not running.
I have now removed BG and installed another AV product. Far too risky for me I feel.
Shame 'cause I'd read good things about it and it seemed easy enough to understand and use. Its just that it had serious problems on this PC. So far the replacement has run fine.
PS - This is a new PC and both BG and its replacement have run full updated scans and found nothing. So I'm certain I haven't been attacked (well as certain as you can be). But BG did not seem to like it.