hi mate
according to the specs for your machine you need PC2700 DDR memory, i am basing this on your processor being an AMD Athlon 2100, although there is a PC model called an athlon2100 which houses a AMD 2800 processor, which in turn uses different memory (PC3200DDR), so you will need to confirm what processor you have matey.

So have a check, go to control panel/system abd it should tell ya what you got