Lordy Lordy,
Can you check the following locations for the following files please.
C:\Windows\my.ini
C:\Windows\my.cnf
C:\my.ini C:\my.cnf
If any of them exist please delete them.
In fact to be super sure, if you find a my.ini or my.cnf file
outside of the c:\wamp\bin\mysql folder structure please delete them.
The my.ini should only exists within the wamp folder structure, and my.cnf should not exists at all.
Sometimes when you have attempted to install MySQL some other way this file get placed in the Lazy locations and gets used in preference to the one supplied by wamp. Also some PC builders seem to have this file loaded as part of the default build, for some obsquire reason.