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： 

• 我认为这与内存有直接关系. -老靴- ♂ (724 bytes) () 05/26/2005 postreply 10:49:10

• 少了个'不'字. 意思全变了...唉. 难怪文革时死那么多人 -老靴- ♂ (0 bytes) () 05/26/2005 postreply 10:49:57

• 哈哈，你有没有想过在你名字前加个“不”字？我看更别致 -ppzcgg- ♀ (0 bytes) () 05/26/2005 postreply 11:03:26

• 福如东海长流水, -寿比南山不老XUE?- ♀ (0 bytes) () 05/26/2005 postreply 13:24:44

• 回复：我认为这与内存有直接关系. -WindowsOSm- ♀ (19 bytes) () 05/26/2005 postreply 19:49:49