Windows 7 Failed Boot

I am running a desktop with Windows 7 Pro 32-bit. When I first power it on the normal BIOS posts and then Starting Windows just hangs, no 4 colored orbs that turn into the Windows logo. I can hit the reset button and it boots and runs fine. I have tried the Launch Startup Repair after the reset button but doesn't seam to do anything. Any suggestions on what is causing this and/or what I can do to correct it?

Thank you,
Greg