It should be there, you probably looked at the wrong place. Try this:
Start a Command (cmd.exe) session, to do so click on Start | Run and
enter cmd.exe in the Run box. At the command prompt enter the following
command:
reg query "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager"
You can copy and paste to the command prompt if you want. The command
is one line there is a space after the second quotation mark (") and
before the redirector (>), the end of the line is:
....\Session Manager" >c:\test.txt
After you run the command look in the C:\ drive find and open the
test.txt file and post the contents here.
The problem that you are experiencing can be caused by virus or malware.
Run up to date virus and spyware scans on your computer to make sure
that you are free of any pests.
John