Clicks and Pops on Audio Input

[THR33_D]

Just recently built a computer and it's working great, minus one small but very key issue... I can play back old projects, I can import audio, and I can play and record virtual instruments all day. The only problem happens when I try to record audio from a mic or synth. Every 8-10 sec I get a few small pops/clicks on the input and it actually records the pops/clicks. I plug the MBox2 into our old computer and it works fine, so I know it has to be an issue with the new stuff. I tried every single optimization for Windows 7 and the only thing I haven't done is go buy a PCI USB card (which I'm doing this week). So I'm at a loss, so any help from you guys would be awesome, and if you could sent me an email, that would be even better. Anybody had this problem before with the setup below?

[email protected]

Core i7 860 Processor Boxed Socket 1156
P7P55-M Socket 1156 mATX Motherboard
Caviar Blue 500GB 7,200RPM 3.5" SATA
GH22NS40 SATA Super Multi DVD Rewriter
4GB DDR3-1333 (PC-10666)
Radeon HD 4350 512MB DDR2 PCIe 2.0
CoolMax 500 Watt ATX 12V
Windows 7 Home Premium 64-bit OEM