XP's memory requirement is just a search away but you'll want to have 512MB if not 1GB RAM to be happy.
What is a Dell L55R? I can't find one.
We have an old Dell with Windows 98 and I want to add a Microsoft Word, Excel viewer. Office 2003 viewers won't install, so I'd like to upgarde to XP. Will this work? What is the minimum memory for XP?