Something is leaking memory in my Vista x64 8GB RAM machine. Now it uses about 40 percent with no additional background programs running. Most of the time it's fine though. Sometimes I can see memory leak and ram usage go all the way to 100percent when installing a big game or extracting big archive. I was never been able to accurately pinpoint what is causing it and after SP2 install I now get random memory leaks like the one currently with 40percent ram usage. Recently I was encoding video with MeGUI/x.264 and saw memory usage climbing again. If it gets to 100 percent it of course becomes VERY slow so I disabled NOD32 real time protection just in case to see what happens as I did not want to cancel encoding process as it takes several hours. Once I disabled real time protection memory usage stopped climbing and stayed here at about 80percent. Re-enabled NOD32 protection again and again saw it climbing to 85percent. Disabled again and again it stopped at 85-86percent. I am NOT saying it is NOD32 fault, I am just trying to pinpoint the problem and thus asking how to see what component is using the memory as task manager does not show this.