Now, Timmcat, here comes the forum dumbo's suggestion. Borrow a 128Mb stick of RAM from somebody, throw it in and see if it boots. If it does, buy one and use it. RAM is cheap as chips. If it doesn't, then maybe you can think about binning it.
But this goes back to my oft-repeated argument that a Pentium 400 with W98SE and 128Mb RAM is more than enough for easy and reliable use on internet surfing and basic applications. Why throw it away just because it's "out of date"? Despite what people are trying to tell you, you won't find a working and reliable computer of that vintage for the twenty quid or whatever a stick of RAM is worth, so what's to lose?.
A thought from a bear of very little brain.