Try that: http://forums.techarena.in/operating-systems/1382204.htm
23-12-2010 Elijah
Re: These files can not be opened I got the solution for this problem and it has already worked for me: Try to create another user. After creating with the help of the administrator toggle to the newly created user. Now in that from the run menu run the command regedit. Now you move on to the HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings. Under that select and perform the right click onto it and export it to the public folder or to the root directory. Then you should toggle back once again to the original user account. Remove the above keys and then run the exported .reg.