Windows OS memory usage issues

I have one cufusion about the way Windows using memory.

I use Windows XP. My configuration is: 1G RAM, 3.4G CPU.
And I have many software installed. Also, I have many applications
/instances running at the same time.

My computer is running slow. So, I open the Task Manager.
I found my memory usage is more than 700M. But, if I tried
to add the individual memory usage together, I just get a little
bit more than 200M.

Why are these two number different? Where are the 500M memory?
How to increase the performance?

Thanks,

所有跟帖： 

• 我認為這與內存有直接關係. -老靴- ♂ (724 bytes) () 05/26/2005 postreply 10:49:10

• 少了個'不'字. 意思全變了...唉. 難怪文革時死那麽多人 -老靴- ♂ (0 bytes) () 05/26/2005 postreply 10:49:57

• 哈哈，你有沒有想過在你名字前加個“不”字？我看更別致 -ppzcgg- ♀ (0 bytes) () 05/26/2005 postreply 11:03:26

• 福如東海長流水, -壽比南山不老XUE?- ♀ (0 bytes) () 05/26/2005 postreply 13:24:44

• 回複：我認為這與內存有直接關係. -WindowsOSm- ♀ (19 bytes) () 05/26/2005 postreply 19:49:49