After upgrading to Windows 8.1, some users are facing problems with using Remote Desktop. Sometimes the Remote Desktop settings is greyed out. It may also show the error
“This computer can’t connect to the remote computer”.
“The problem might be due to low virtual memory on your computer. Close your other programs, and then try connecting again”
The issue can be fixed by editing the registry key
HKEY_CURRENT_USER\ Software\ Microsoft\ Terminal Server Gateway\ Messages\ <Domain>\ <USERNAME>\ UserPreferenceOption. Change value from 1 to .