Latency problem after xperf and new nvidia driver

[latka]

Much thanks in advance.

I am running Windows 7 (64) and am having a huge latency issue 100% of the time). I ran an xperf and the results showed a large spike on nvlddmkm.sys (Actual Duration 688):



I downloaded and installed the new driver from Nvidia, and restarted my computer, but the latency problem is still there 100% of the time. Any ideas?

 

[latka]

I wanted to add a few more screenshots from DPC Latency Checker and LatencyMon:





I also performed a Windows Memory Test, which found no problems. In addition I made sure Windows Update had everything up to date.

Any ideas?

 

[latka]

I thought I'd add my system info:

OS Name Microsoft Windows 7 Home Premium
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name LATKA-VAIO
System Manufacturer Sony Corporation
System Model VPCF226FM
System Type x64-based PC
Processor Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz, 2001 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. R1170V3, 4/20/2011
SMBIOS Version 2.7
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume2
Hardware Abstraction Layer Version = "6.1.7601.17514"
Installed Physical Memory (RAM) 8.00 GB
Total Physical Memory 7.98 GB
Available Physical Memory 5.35 GB
Total Virtual Memory 16.0 GB
Available Virtual Memory 12.6 GB
Page File Space 7.98 GB
Page File C:\pagefile.sys

Also, the DPC Latency Checker is all over the place. It can go for several minutes spiked above 16000ms, but I've also had a stretch or two of 1-2 minutes with everything under 1000ms. Here is another screenshot: