Windows has never been particularly at handling memory, and in particular, if you're running the 95 or 98 versions of the OS, your RAM is probably being unneccessarily hogged all the time.
RAMBoss is designed to help you take charge of your system memory in order to make your computer run faster.
Although it's user interface is basic to say the least, it provides a very straightforward way of managing your memory.
It displays a progress bar showing how much RAM is installed on your machine. Here, you can set the the amount that you want to keep free. Then, simply hit the 'Optimize' button and the program will adjust the system to your new requirements.