Internet Explorer 11 64-bit will not start

Internet Explorer 11 64-bit gives a message that this program cannot start normally. A Google search shows that others are having the same problem. I have tried some of the "solutions" including some from this forum and none have solved the problem. I finally uninstalled IE 11 and reinstalled it. The problem persists.

A very perplexing aspect of the problem is that the progam will work fine sometimes: after computer startup, if it works it will work fine, but it may not work at all after the next reboot. If it fails after a restart it will not work at all (same message) until the next reboot then it may or may not work OK. Firefox works fine.

OS Name Microsoft Windows 7 Ultimate
Version 6.1.7601 Service Pack 1 Build 7601
OS Manufacturer Microsoft Corporation
System Manufacturer DELL Inc.
System Model Studio XPS 435T/9000
System Type x64-based PC
Processor Intel(R) Core(TM) i7 CPU 940 @ 2.93GHz, 2934 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date DELL INC. A16, 3/19/2009
SMBIOS Version 2.5
Windows Directory C:\windows
System Directory C:\windows\system32
Boot Device \Device\HarddiskVolume3
Locale United States
Hardware Abstraction Layer Version = "6.1.7601.17514"
User Name Charles-PC\Charles
Time Zone Eastern Daylight Time
Installed Physical Memory (RAM) 12.0 GB
Total Physical Memory 12.0 GB
Available Physical Memory 9.26 GB
Total Virtual Memory 24.0 GB
Available Virtual Memory 20.5 GB
Page File Space 12.0 GB
Page File C:\pagefile.sys

 

OK,

I ran this from command prompt:
"C:\Program Files\Internet Explorer\iexplore.exe" -extoff

I had previously tried (on an occasion when IE decided to run) disabling all add-ons.

I have also run scannow.

Nothing has solved the problem.

Charles