GRRRR!! I had just typed a heap of info and lost it >
Only thing about getting another piece of ram for a hp or other name brand PC is that you may need a special piece of ram (yes there are many different types of SDram) there are 2 main speeds but most pc-133 ram will step back to 100, then there is double sided, single sided, silver and gold..... Anyways You could take it into a place like Umart and ask them to try a couple of differnet sorts for you? Cheapest they have is 128mb PC-133 for $55.00, the Disc Shop is quite cheap also but don't have the range of SD ram umart has.
I have a couple of 64mb SDram cards at home somewhere, your more than welcome to try them if you like? they are old but i am sure that most of them are still working its been awhile.. anyways let me know and we can organise something..
cheers
Brandon.