I could not find a driver for hp color laserjet cm2320 mfp printer. My sysem is win 7.
Well - you know what you have for hardware : HP Color LaserJet CM2320 MFP
So... what did HP tell you?
Hardware support - including the drivers and other software that allow the device to interface with other software and hardware - comes from the hardware device manufacturer.
That printer was essentially abandoned in newer OSes by HP a while back, it seems...
http://h30434.www3.hp.com/t5/Printer-All-in-One-Software/CM2320-mfp-has-been-abandoned/td-p/218486
Although it should 'work'...
You may want to get the drivers and software you can from HP. Choose your specific printer though...