SpyderTracks
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So you need to uninstall Bullguard.I'm not sure if I've even seen it running IIRC
Have you installed anything like malwarebytes?
If fact, any change you can just to to programs and features in control panel and so we can see if there are any conflicting programs?
What I'm thinking is, Bullguard is known to be problematic with networking and high CPU usage on scans. It seems to get locked when it's scanning. When you're downloading content, the AV scanner will scan that in realtime as it's downloaded.
I wonder if Bullguard is getting locked up somehow, perhaps conflicting with something else, but even if not, it still needs uninstalling.