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Follow the above link to help remove hotoffers
Download the Pocket KillBox
Unzip the file to your desktop.
Run Pocket Killbox and paste the full file path of each of the below files in the box and click on Standard File Kill and End Explorer Shell While Killing File. Click on the button with the red circle and an X in the middle after you enter each file (see the files below).
C:\WINDOWS\System32\systr.dll
Reboot afterwards if the files are successfully deleted.
If all files are not deleted, do not reboot yet. Run Pocket Killbox again and paste the full file path in the box and click on Delete on Reboot. Next click on the button with the red circle and an X in the middle. You will get a message saying "File with be deleted on next reboot, Process and Reboot now?" Click "Yes" to reboot only after the last file you enter.