Easy to install as long as you have a Windows 98 boot disk..
There are plenty of websites covering this, but why not just use the microsoft one at
http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/q221/8/29.asp&NoWebContent=1
after all it is their product..
Any questions, dont hesitate to ask..