We are in the process of installing GE Radworks stations. This requires Windows 2000 or NT and I purchased all of our systems from Dell who said they would send the pc’s with Win2000 but when they arrived had XP Pro. Dell is unwilling to swap OS’s they would rather me sent the PC’s back. My question is since I already have the XP Pro’s Licenses can we install the 2000 and be covered or do I have to purchase Win2000 Licenses?