You might have seen process or image System using up more memory but almost no CPU usage. There is 60,000 k of memory usage that the process system is eating up making your PC slow and freeze. The process System is the collective name of all the active sub process in the kernel(the core of an OS). The problem is that you cant know what sub process of process system is causing this high memory usage. To find that, use a program called Process
Process Explorer, shows the break down of sub process, showing memory usage of each one, helping you find what actually accounts for more of the overall memory usage of the process.
If in any case you are not aware of a particular sub process, google it to see if its a spyware and fix it.
Click on the image for full screen view. To get an interface like what you see in this image, in the Process Explorer, go View > Select Columns>Process memory tab. Check Working set size. Click OK. This will now show RAM/memory usage. Then, in main window, look for System process. Expand it, so sub processes are shown.
As you can see from the image above, the problem lies with the svchost.exe while i was expecting AVG module, avgwdsvc.exe to be the culprit. In that case, uninstalling AVG and reinstalling the latest version seldom helps. Looking for an alternative such as Avast or even better a paid one such as Kaspersky helps.
After examining, it seems that svchost should be a process on its own and in some cases it gets nested under system when sub process of svchost accessing that of system.
Researching more, shows that avdwdsvc.exe which is known as AVG Watchdog, a service that monitors other AVG components, to be examined. As expected the problem lies here. Seems like there is a memory leak, ie. more memory usage.
To fix this disable AVG watch dog service. To do that, go Start Button > Run > type services.msc. Find the service AVG8 Watch Dog, right click on it, click disable. Exit and reboot. By then the problem must be solved if not uninstall AVG.
To prevent high memory usage of processes, its must to have a reliable registry optimizer in addition to a firewall, antispyware and antivirus program. This is because, after a spyware fix, its must to clean its remnant, to avoid invalid registry entries slowing down your PC.