I have Windows 7 64-bit Professional running on Intel Core 2 Duo, 4 GB RAM and nVidia 1 GB graphics card. The Task Manager shows only 3 GB of RAM, so I am assuming 1 GB is used by the graphics card. After I use the system for about 30 minutes, all of the memory gets used up and the system is responding very slowly. When I check the Task Manager, the CPU usage is low, but the memory is above 95%.
I cannot identify the process which takes up memory. But this started happening after an update installed service pack 1.
What might be the problem?