Update the drivers for sure! Your going to need more memory also. IIRC Windows 98 eats up 112 mb itself. I'm not sure about Windows Milly but I'm sure it's in the same area. Another 128mb will run you about $20. Unless you get a deal like I did. 128mb $4.99 after rebate!

Pricewatch.com is a great place to start your search. Good luck!