In windows task manager under performance tab ,I can see the total memory 523760 wich i supposed is the physical 528 ram stick i got inside,I wonder if this is usual to see the available amount of memory goiig down by itself then it could increase then decrese and so on without any program that im concern executing task in the background .system cache also then i can see manymany short spike in the CPU usage history without even moving my mouse i can see cpu usage graph showing 2 percent then 0 then 2 but once in the process screen i cannot idetify wich task is doing this steady usage of the processor again its not the mouse movement using it somtime the cpuusage history graph showing 100% peak usage then coma back to 0 also happen thanks for anyone who might to give his impression.

7athir

This is normal.
You are running tasks that you cannot see.
For example, the task manager itself is using some CPU power to process its own data.

Your memory is 512 MB. If you are running your average programs / game, and your free memory is less than 10 MB, then you could consider adding another 256 if you really wanted to. Other than that, everything is normal.

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