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Can't get rid of Trojan on Windows 7 Dell Laptop

We have purchased and run Malwarebytes several times, and each time after the restart, Malwarebytes  STILL reports a Trojan.


Vendor:  
Trojan Agent

Category:  
File
Memory Process

Item:
c:\Windows\svchost.exe

Other:
4172


How can I clean this out?  I recall there being some very strong "medicine" I can use.


Thanks.


Larry
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younghv
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This one is quite resistant!  It couldn't be removed by RogueKiller or Combofix.

What's left to run?
If you followed the articles recommended by younghv, you would have run RogueKiller, let it do its prescan, then clicked its Scan button in the upper right corner... when that scan's done, minimize (DO NOT CLOSE/EXIT)  RogueKiller, then do a full scan with MalwareBytes AntiMalware (MBAM for short).
on severe cases, i gain more time by a full reinstall, than by cleaning the system, so that's my suggestion : a fresh install
@computerlarry

<<This one is quite resistant!  It couldn't be removed by RogueKiller or Combofix.
What's left to run?>>

I suggest that you actually read the advice that has been offered, then follow the instructions.
You might also review these suggestions from EE that seem to be applicable:

"Three Rules":
https://www.experts-exchange.com/help/viewHelpPage.jsp?helpPageID=13

I am sorry, but I cannot assist you any further on this question.  Perhaps there may be another Expert here who can.

I wish you good luck in this endeavor, and perhaps I will be able to help you on some future question.
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Good recommendations, but I had a serious problem. I ended up backing up the User files, extracting all the serial numbers, then erasing and re-installing.