Windows 7 new install lagging

I just completed a major upgrade to my computer; new motherboard, video card, processor, memory, hard drives. I did a fresh Windows 7 install (what a nightmare it was to get my valid, authentic serial number working, but that's a story for another day).

Most of the time, the system is running lightning fast, as it should be with an 8 core processor, 16gb of RAM and overclocked NVidia GTX960 graphics card. But I have noticed that my system seems to "hang" pretty frequently. I'll be moving the mouse, and it just freezes for anywhere from half a second to as long as 5 or 10 seconds. The same thing happens with the keyboard; I'll type a few letters, or hit a hot key several times, and there is a 5+ second delay before the keystrokes register.;

Normally, I would assume something like this is caused by old or generic drivers, but I installed the manufacturers most up to date drivers for the motherboard chipset and graphics card. Is there something obvious that I'm missing? Something is obviously wrong; an $800 machine should never lag when doing nothing more than file browsing.

Thanks

 

What security programs are you running? Sometimes when a security program keeps checking everything you do, it can cause hangups/freezes.

 

Please post your system specs, To include Make and model System if Big Box, or same info for the following if custom or home built, Mother Board (including Revision number), Processor (Exact Model Number), Ram, Video Card, Hdd(s), Optical Drive(s), Power Supply Manufacturer Model, Wattage and Amperage on the +12V Rails, OS, and any other peripherals installed on the motherboard.