Need some help with my USB ports because it won't detect anything .

I'm not sure which place should I post my issue so if I did wrongly please letd know.
Hi. I'm new to this forum and it's my first post. Recently im having problem with my pc.
These few days my pc start not to behave normally. Sometimes it just will hang suddenly. And now I have a clean install window 7 home premium 64 bit and now I'm stuck with the set up window part becaus it won't detect any USB port at all. I tried to insert all USB port to see if it can detect my mouse or keyboard. I've tried it on another pc and it works fine. I really need help. My pc now is like without hand and leg but only body.
This is my pc spec

intel core i5-2500k,gigabyte z68ap-d3 mainboard,asus gtx550 graphic card,kingston ddr3 4gb ram,500gb sata harddisk,cooler master 500w power supply,coolermaster glite 310 casing,lg dvd writer

After the clean install of your OS did you install your drivers for your mobo?

What is mobo? I can't do anything at all now because I can't do anything without the mouse or keyboard .stuck on window set up

I got mobi mean now. But the problem is I still can't pass the set up new window setting which need me to choose the language or time setting thingy.

mobo = motherboard. Have you tried rebooting the system?

Please fill in your system specs of your system in the user profile area.

intel core i5-2500k,gigabyte z68ap-d3 mainboard,asus gtx550 graphic card,kingston ddr3 4gb ram,500gb sata harddisk,cooler master 500w power supply,coolermaster glite 310 casing,lg dvd writer

I really need some help right now . I have done everything I could such as unplug re plug restart all the things I could. And I got the same result.

Is there anyone who know what's happening with my desktop ?
I'm still unable to get into window. I'm stuck somewhere that after a clean install window 7 that require us to complete few selection that setting the time zone and language . Because the CPU doesn't detect my mouse or keyboard at all. I'm cant fall asleep at all right now. And it's 6am. Sad~ My CPU are only use about 5-6 month old.