I had a case where suddenly I could not remote login to my work PC from home.
Tried everything, updated Java, updated IExplorer to the latest version, and many other cleanings of old registry items but nothing helped.
The fix was for me to create a new Windows 7 user account in my home PC.
Once I logged into the PC with the new user name all the remote login problems to work were solved.
Give it a try.
Ronnie Shand