Your computer needs a reboot ever so often to clear the memory. Even after you leave a program, there is still some residual memory used. After a length of time, your memory will "get clogged up." Windows NT is most effective at clearing memory, but the earlier versions of Windows can be affected by use without a reboot. Even if you leave it on, do a reboot know and then.

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"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."
- Albert Einstein (1879-1955)

"God is a comedian playing to an audience too afraid to laugh."
- Voltaire (1694-1778)

"I shall not waste my days in trying to prolong them."
- Ian L. Fleming (1908-1964)