Hello, Answering your question about the file, O see that it is from a folder with a prorgam which is an English phonetics teaching program. I looked in the folder and it looks like it is the main running program of the teaching system.
Also before I received you answer I tried to use the last instructions from Kaspersky lab once again
RD /S /Q "%WinDir%\System32\GroupPolicyUsers"
RD /S /Q "%WinDir%\System32\GroupPolicy"
gpupdate /force
The Rusearcher did not dissapear after that.
After that I ran some antivirus programs once again. I think the last was Malware bytes antimalware
Ver: 2.2.0.1024
malware database: v2016.02.06.03
rookit database: v2016.01.20.01
I ran the program in the deep scanning mode with euristic on and it found 3 more files
PUP.Optional.OpenCandy, C:\Users\Boris\AppData\Local\Temp\HYDBF66.tmp.1454754020\HTA\3rdparty\OCSetupHlp.dll, , [c7b4025bddbcfd39bf50ed01e222ae52],
PUP.Optional.OpenCandy, C:\Users\Boris\AppData\Local\Temp\HYDCA10.tmp.1454753957\HTA\3rdparty\OCComSDK.dll, , [8deef7660f8ab97d6a059ba4d2300ef2],
PUP.Optional.OpenCandy, C:\Users\Boris\AppData\Local\Temp\HYDCA10.tmp.1454753957\HTA\3rdparty\OCSetupHlp.dll, , [c7b4124b5346c571898613dbf410ae52],
and after rebooting the computer I opened Chrome and I do not see any "Set by administrator" sign in the settings for the search system as it was before. The search works fine without calling any unwanted "Rusearcher.com". I hope that the problem is solved now.
Before I solved the problem (hopefully) I ran all the software adviced in the articles in you site and the other places. Kaspersky, Spyhunter (found quite a lot but did not solve the original problem), chrome clean up tool, spybot, tds killer, Rkill, hitman, mbam finally again in deep scanning mode.
Now I may try to run ZOEK and may be hitman and spyhunter again for double check, but do not think that anything is left.
programs from this article for example
How to remove trojans, spyware, rogues and other malware
My Kaspersky license expires today. Would you recommend anything else (I use windows 7 home extended 64 bits)?