Dell Inspiron E250? are you sure that is the model? Can't find it listed
Is it a laptop or desktop?
If it has PC Restore on hard drive as most Dells do, have a look at instructions on thread click here
and yes you will get some probs with reinstall from CD as you will also need the Drivers CD (available to download from Dell)but it will wipe the PC Restore option off and you will have to activate XP.