Hi, always willing to listen, but I've built my own computers since the 80's - only recently said 'enough' and bought hardware, mistakenly believing that I'd have an easier life :-(. This is a Toshiba Satellite Pro C850-1LV with 4MB RAM, running Windows 7 64bit Pro. Malwarebytes Pro installed and Zone Alarm Antivirus and Firewall, also runs Acronis 2012, so I'll consider doing that, after I've tried everything else. Transferred to SSD over a year ago and still no problems - still a nice 35 second total boot. I've tried a diagnostic startup - same. Strange thing is, it works smoothly in Safe Mode. I've just ordered a recovery media USB (I won't be able to sit down for a week!), so until then, I can't try any repairs using Windows install.