Do not trust this number!

They will say that you have a unique CLSID. THEY ARE LYING.

It will be 888DCA60-FC0A-11CF-8F0F-00C04FD7D062.

Everyone has it! They will make out that it is unique.
This is actually the CLSID for the ZFSendToTarget file extension.

See http://securelist.com/blog/incidents/33734/trying-to-unmask-the-fake-microsoft-support-scammers-17/ for more details

They will tell you to open Event Manager to try to identify errors, warnings and other information that can be used to trick you into thinking that the computer is infected. The event viewer does show error messages, but not directly related to an infection. Almost all computers have errors in the log files, especially if the computer has not been re-installed lately and is running a lot of programs.