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Hi, I installed Malwarebytes few days ago to wipe out adware. This morning I started my PC and before the login screen all I got was a black screen and a blinking cursor. I tried everything but its unresponsive. I think it has happened because Malwarebyte accidentally deleted something important. Please tell me how to solve this problem. I've read countless threads but I'm not getting anything. Please help as soon as possible. And if its that process of loading log.txt and another txt file, please explain thoroughly. Help!

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OK, this is a very complicated issue to attempt to repair.
First thing is to backup your data.  Here's a link to a forum where you can get help with that:  http://www.bleepingcomputer.com/forums/f/238/backup-imaging-and-disk-management-software/

The next step is to try a System Restore to a point before you started having these problems.  It depends on which version of Windows you are using as to how you access the repair functions.

If that didn't work, then the next thing is to attempt to fix the damage done by the malware.  Try this forum for that:  https://forums.malwarebytes.com/forum/7-windows-malware-removal-help-support/

If that's not able to fix it, then here's some other things to try:

 

NOTE:  Try a clean boot to see if the problem clears up that way:  http://www.thewindowsclub.com/what-is-clean-boot-state-in-windows
If it does, then different troubleshooting steps are called for.

Here's some repair/recovery/restore options (in this order).   Be sure to backup your stuff if you don't want to take the chance of losing it.:
1 - Startup Repair.  Run it 3 times, rebooting in between tries.

2 - System Restore to a point before this started happening.

3 - DISM/SFC repair (DISM doesn't work with W7, although SFC does)  - doesn't work if you're not able to boot to Windows (let me know and I'll post a way to do it from Startup Repair)
     Then please run the following DISM commands to see if there's any problems with the system (from an elevated (Run as administrator) Command Prompt).  Press Enter after typing it:

              Dism /Online /Cleanup-Image /RestoreHealth

    FYI - I have repaired systems using the last command even though problems weren't found with the first 2 - so I suggest running them all.

    From this article: http://technet.microsoft.com/en-us/library/hh824869.aspx

    You can also run sfc.exe /scannow from an elevated (Run as administrator) Command Prompt to check for further corruption. Include the CBS log (located at C:\Windows\Logs\CBS\CBS.log) if you'd like to have a Windows Update expert check it (I don't check them because I can't read them)

4 - RESET using the "Keep My Files" option (W8 calls this a REFRESH; W7 and earlier doesn't have this function)

5 - Repair install of the OS (Thanks to FreeBooter!):
    "How To Perform a Repair Installation For Windows 8, 8.1 and 10"
    https://www.winhelp.us/non-destructive-reinstall-of-windows-8-and-8-1.html

    "How to Do a Repair Install to Fix Windows 7"
    http://www.sevenforums.com/tutorials/3413-repair-install.html

    "How To Perform a Repair Installation For Vista"
    http://www.vistax64.com/tutorials/88236-repair-install-vista.html

    "Non-destructive reinstall of Windows XP"
    https://www.winhelp.us/non-destructive-reinstall-of-windows-xp.html

6 - RESET using the "Remove Everything" option (W8 calls this a RESET; W7 and earlier doesn't have this function)

If using W7 or earlier, this can be accomplished by resetting the system by use of the recovery partition/recovery disks/recovery drive.
If you don't have them, you can usually order them from the OEM manufacturer of your system ( US points of contact here:  http://www.carrona.org/recdisc.html )

7 - Wipe and reinstall from the Recovery Partition (if so equipped)

8 - Wipe and reinstall from Recovery Media - to include deleting all partitions.
If you don't have them, you can usually order them from the OEM manufacturer of your system ( US points of contact here:  http://www.carrona.org/recdisc.html )  You can also download W7/8.1/10 from Microsoft starting on this page:  https://www.microsoft.com/en-us/software-download/

9 - A clean install of Windows.  This is a troubleshooting tool - and as such is slightly different from the previous steps.  In short, if it fixes the problem, then the problem was in the software.  If it doesn't fix the problem, then the problem is most likely in the hardware.
A clean install is:
- Windows is installed to a freshly partitioned hard drive with legitimate installation media (W10:  https://www.microsoft.com/en-us/software-download/windows10 ).
- The installation media is only a copy of Windows, not the OEM recovery disks that you can make on some systems.
- Windows is fully updated after it's installed.  That's ALL updates - none excepted.
- NO 3rd party software is installed.
- There are no errors in Device Manager (if you find any, post back for suggestions).

This will wipe everything off of the computer, so it's advisable to backup your stuff first.
Also, it will wipe out all the special software that the OEM added to the system, so if you rely on any of that - let us know what it is so we can figure out a way to save/download it (the easiest way is to create/obtain the OEM;s recovery media)

If unable to find recovery media that has the software (or if you suspect that this is a hardware problem), you can make an image of your system that'll preserve everything in the state that it was in when you made the image.
One drawback to this is that you're making an image of a malfunctioning system - so, if there are errors in the system software, you'll have a nice copy of them :(
Another drawback is that the image of the system will be very large - so you'll most likely need a large external drive to store it on.
But, this will allow you to save everything on the hard drive (although you'll need an image viewer to get things out of the image).
The point here is that, if it's a hardware problem, then you can restore the system to the point it was when you made the image - after you repair the hardware problem.
You can obtain more info on imaging in the Backup/Imaging/DiskMgmt forums located here:  http://www.bleepingcomputer.com/forums/f/238/backup-imaging-and-disk-management-software/

The point of doing this (the clean install) is to:
- rule out Windows as a problem (if the problem continues, it's not a Windows problem as you completely replaced Windows
- rule out 3rd party software (if the problem continues, it's not a 3rd party software problem as you didn't install any 3rd party software)
- so, if the problem continues, it must be a hardware problem.

OTOH, if the problem stops, then it was either a Windows or 3rd party software problem.  If the problem doesn't come back, then you've fixed it.  Then all that remains is setting the computer back up the way that you'd like it and importing your data from the backup you made.

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Hi,

Thanks for the elaborated answer but I did solve it. Needed to do only two steps :

1) Backed up my data.

2) Install a fresh copy of windows.

That did it. Cheers!

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Glad to hear that you got it sorted out!

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