Mmm, I saw something like that some time ago, it made it devilishly difficult to enter the password on the machine, pressing keys and backspacing incorrect letters out. I seem to remember it was a malware "bit of fun", and that MBAM solved it.
==Please download Malwarebytes' Anti-Malware
=Dclick that file, mbam-setup.exe, to install the application,
-ensure that it is set to update and start, else start it via the icon, and UPDATE it.
Select "Perform QUICK Scan", then click Scan; the application will guide you through the remaining steps.
ENSURE that EVERYTHING found has a CHECKMARK against it, then click Remove Selected.
If malware has been found [and removed] MBAM will automatically produce a log for you when it completes... do not click the Save Logfile button.
Examine the log: if some files are listed as Delete on Reboot then restart your machine before continuing.
Copy and post that log [it is also saved under Logs tab in MBAM].