I disabled Trend Micro and downloaded ZASS again Ė this time successfully. I tuned off ZASSís virus protection and reloaded Trend Micro. So far the IE tabs are functioning properly and allís well.
I have been running Zone Alarmís firewall in conjunction with Trend Microís full security suite for years without problems until recently. Way back, my IT department recommended these two programs - Zone Alarm seemed to have the best firewall and Trend Micro the best virus protection. I also periodically deep-scan with both plus Ad-Aware and Malewarebytes. In general, I have found Trend Micro picks up what Zone Alarm misses; Adaware picks up what both missed and Malewarebytes has nailed a Trojan for me that the other three could not eliminate.
As technology advances and most everyone offers Security Suites (I can no longer buy Zone Alarmís stand-alone firewall), I must be more careful how I manage them but down the road I may be forced to one. I still feel Zone Alarm has the best firewall and Trend Micro the best virus protection. But hey Ė who really knows??
Many thanks for your input.