the restore downgraded me to 2.5 and the problem was fixed - I'm now up to 2.7.1 and the fan problem has not happened again
so I don't think the fan problem was related to pcm - just an unfortunate coincidence that it happened at the same time I updated pcm
Strange - on my other pc (also Win7x64), it was the dashboard that wouldn't start (the monitor started ok)
So I uninstalled both monitor & dashboard, deleted the \pc monitor folder, hacked the registry and deleted all MMSOFT & PC Monitor keys, ran a (Norton360) registry cleanup, then re-downloaded & reinstalled both monitor & dashboard
I then had to delete the 2 "old" pcs from my account, but it's all working ok now
ps. also noticed that although the download links say version 2.7, after installing, it's actually 2.7.1