Have run Malwarebytes and Adaware. Malwarebytes comes up clean. Adaware found three unrelated PuPs. Browser keeps non-responding for seconds with each action as does Outlook 2010.
Toshiba Satellite P55t-A5118 with 1TB HDD, Win 10 pro (upgraded from Win 8.1 which was the original OS), i7, 8GB.
Help would really be appreciated - no new SW installed to my knowledge other than Google Drive (which I didn't authorize an install of) and Adobe Flash update 188.8.131.52.