Sorry for the delay in closing this. Ran hwinfo while scanning and processor temp rose slowly to 108C, then computer shut down. Opened it up to clean it - some dust but not too bad; removed fan from processor to clean it and noticed the space between the heat sink fins packed with 'dust' - cleaned that out and all is well. Thank you.
TIA - Win 8.1 - Kaspersky Internet Security 2016. When I try to run a full scan, scan begins then computer shuts down. I downloaded and installed EEK fearing there was some kind of malware causing this problem EEK scan reached 98% and computer shut down. Any suggestions?