This post is most relevant to windows 8 users. Here I am posting how to update
windows 8 to windows 8.1.We can look some of the important things to be
remembered while updating to windows 8.1.
*Some strange behaviours are occurring while we updatingusing
Microsoft service pack.This occure in 64 bit edition.
*Windows 8.1 64 bit edition needs CMPXCHG 16 b hardware featured
processor.if its not then it will show the error message “Processor does not support
compare exchange 128”
*Windows 8.0 get update and support only upto 2015.Before
2015 we want to update to 8.1.But we can
think that Microsoft will suggest a solution for windows 8 users.