IIS can only be installed on the professional editon of windows.
Well it's a bit more complicated than that see this link for more info :
Anyway try to see if it is available via the control panel | programs | turn windows features on or off.
See if IIS is in the list. If it is, you can install it and check if the functionality you need is supported yes or no.
For windows XP it was pretty clear you needed pro, now the info in the link is a bit more subtle.