Programs don't free memory

[Nguyen Danh Hieu]

  Hi everybody
  Sorry for my bad English but I have a question.I have 512Mb memory on my
PC but as I realize at starting my system have about 100Mb active memory,
but when the system have worked for a while there is no free memory on my
system ( about 350Mb inactive) As I understand this means some programs (
like kdeinit) don't want to free memory after workes. Is this true? How can
I fix thís problem out?
  Thank you
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Nguyen Danh Hieu

Physics Faculty
Moscow State University