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I did that and after an hour I get into the same situation as I was before. It loose the lic file and reg keys.

@Marcos Hi, I did not uninstall and then install the product - just install it over. Today I tasted it with brand new windows 7 x86 and after same installation stopped at early point where it tells me about strange activity - possible virus I was able to fully install the product, scan the system, update, restart it a couple of times without errors. May be 2 hours later suddenly the antivirus pop-up a massage that there was a problem with updating procedure. And there is no "Username" and "Password" under HKEY_LOCAL_MACHINE\SOFTWARE\ESET\ESET Security\CurrentVersion\Plugins\01000400\Settings

Hi everyone! To Marcos: I have/I am having the same problem, and I tried: 1. Reinstalling the ESET Endpoint Antivirus on my computer 2.Cleaning registry and scanning for data integrity since sometimes gives me an error about some strange system behaviour. -> Everything is ok. 3. Running tasks to my computer from ERA server to: Activate the product; Update Modules; Run a system scan - > all failed as there was no communication with my machine. 4. Multiple restarts (just for fun). And big surprise today 05.01.2018y at 18:35h (we are +2 hours UTC ) license.lf in C:\ProgramData\ESET\ESET Security\License have been modified , I am not sure if it has been created at that time. and all failed tasks are now started, some finished , modules are updated . The first time I had a problem with credentials and live grid was on 01.01.2018 around 14:30h. So, I have 139 computers with problem now out of 1300 and if i am right about 300 more to update to ver.6.6.2068.1. and I will be happy to help. PS I check for licence file in 10 random computers of now 164 and the Licence folder is empty!