- What do you mean "you shut down computer to let it install updates"!? (I'm a Software Tech)-
That is Not how you install updates!- If you have Automatic Updates installation enabled (I do manual...), you Must slow reboot Three-Times Before Shutdown!
As Opera/Chrome get their settings from IE...-
After the next day's cold startup, wait 40min (for your AV to Trust changes...(moving cursor All over the desktop...)), and reboot again-
Then Open/close Control Panel (show All too), then IE 4 times (wait 2min between open/close!).
Then open/close Opera 4 times (same wait...) before browsing. Sometimes I have to clear browsing data (Forever...!)/reboot, if Opera is balky..., then the same open/close again... before browsing...
Note- Depending on which AV you use?-
All Security Suites are slow to Trust... (I use ESET Smart Security v8), results may vary...
It also is a Good idea to Open/close Control Panel (show All too!), before opening browsers..., or doing Java/Flash updates.