I assume that you are running Windows 2000 or XP.
If so, you will see a real benefit from increasing your RAM.
I consider 256MB the minimum for either OS, and usually MAX out the installable RAM on the system.
(within cost reason, 1GB DIMMs are still too expensive)
Next, consider setting up a fixed size virtual memory (swap) file.
I am a bit more aggressive than some others here.
I recommend that virtual memory be the larger of 2X installed RAM, or the difference between 1GB and installed RAM.
For your system as configured, I would set / allow Virtual memory to 872MB.
You access the virtual memory settings from either:
Control Panel / System Properties
Or, right click on My Computer and select properties.
For XP, the click sequence is:
Advanced tab,
Performance settings,
Advanced
Virtual memory
Chas