Hey i have a dual core processor as well and i was trying to run FFIX. The easiest way is to do this.
Whenever you open your emulator open up task manager (alt+ctrl+del) then goto the process tab. find the process epsxe.exe, right click on the process and choose set affinity. Once in this menu uncheck the CPU 1 checkbox but leave CPU 0 checked. Click OK and close task manager, now your game should take a little longer to open ut will run at proper speed. !
Have fun and thanks

Shendo

for the idea.