My problem is with the System: NT Kernel & System using a constant 25% CPU even after restarts. I have tried googling the problem and found people saying to uninstall all Network adapters, try using sfc /scannow, change the page file and scan for Rootkits. I have done all these with no success. I done a system restore which managed to solve the problem but then I had to restart to update AVG(v2012.0.2221) and Nvidia drivers(306.02). The restart brought the problem back which makes me believe that it may be one of these that is causing the problem but both are essential to the use of my laptop.
Using ProcessExplorer I have narrowed the problem to ntoskrnl.exe KeReleaseInStackQueuedSpinLock+0x1e0.
Can anybody help me solve this problem? I might not answer until 24 hours after this posting time as I have work tomorrow which is a long shift but if somebody replies quickly I should be able to get it. Thanks in advance.
Intel Core i5-2450m
Nvidia GT 540m (Optimus w/ Intel HD 3000)
8 GB DDR3 RAM