Clear Your System Memory without Restart

In windows machine, Its a quite common phenomena, that the machine gets slow down, when it is powered on for days. Some of us, would be addicted to refreshing the desktop quite often, as if  the system is running faster, after the desktop refresh. Some knows the truth, i.e, System memory is getting accumulated with lots of garbage. A simple system Restart is the only known solution for clearing this garbage so that the machine would be back to work with its maximum performance.

Its not only the normal windows machine, even powerful windows servers requires a periodic restart to clean up this garbage (or Memory Leakage). So there arises a question,

Is there a solution to clear the memory, without restart?

My search of this solution, ends up in the following url,
http://www.pctipsbox.com/how-to-clear-your-memory-without-restarting/

As per the above document, if you run the following Run command, it will clear the memory.

 %windir%\system32\rundll32.exe advapi32.dll,ProcessIdleTasks

Unlikely to ones expectaion, this command does not display any notification, whether the process succeeds or fails. However, in my experience, I felt that this utility improves the speed of the windows machine. And, A Desktop shortcut created for this Run Command, would speed up the accessibility.

So far, what I have told is widely known information spread across in Web. But there is a disclaimer for this information, which is an excerpt from one of the comments. According to which, this run command just do a maintenance task for the idle processes, and it does not clear any memory. Whatever be it, its a good utility, may be at some critical times.

Disclaimer : This Utility would fail in Windows 2000 and lower.