Download the zipped patch file (direct download link) that includes both original and patched version of termsrv.dll file for both 32-bit and 64-bit editions.
Stop Remote Desktop Services service from Services MMC console.
Replace the ownership of termsrv.dll file in Windows\System32 folder with an user account that has local admin privilege. And give that user a full control permission on termsrv.dll file.
Make a copy of original termsrv.dll file and overwrite it with one from zipped patch file downloaded on step 1.
Restart Remote Desktop Services or reboot your computer.
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