<Tr> <Td> Windows XP </Td> <Td> 25 October 2001 </Td> <Td> NT 5.1 </Td> <Td> <Ul> <Li> Windows XP Starter </Li> <Li> Windows XP Home </Li> <Li> Windows XP Professional </Li> <Li> Windows XP 64 - bit Edition </Li> <Li> Windows Fundamentals for Legacy PCs (8 July 2006) </Li> </Ul> <P> See Windows XP editions </P> </Td> <Td> 2600 <P> (Service Pack 3) </P> </Td> </Tr> <Ul> <Li> Windows XP Starter </Li> <Li> Windows XP Home </Li> <Li> Windows XP Professional </Li> <Li> Windows XP 64 - bit Edition </Li> <Li> Windows Fundamentals for Legacy PCs (8 July 2006) </Li> </Ul> <Li> Windows XP Starter </Li> <Li> Windows XP Home </Li>

How many versions of windows operating systems are there