HT1420 I recently got a new operating system on my two-year old windows computer, but itunes says that I need to authorize my computer and I already have authorized five computers.  I think I should deauthorize all but does that deauthorize my ipad and ip

I recently had a new operating system installed on my two-year old windows computer.  iTunes wants me to authorize my computer (again) and then says that I already have five computers authorized.  Should I deauthorize all?  Would that affect my iPad and iPhone?  I may have old, non-functioning computers that are still authorized and should be removed. 

Your past purchases are not on the computer.   By choosing download all, those purchases will download to the computer. 
Once authorized to your iTunes account you can control the computer.
When syncing the iPad the first time you will get the warning " this iPad is synced with another computer, syncing will erase all contents and replace with the contents of this computer"
Say yes, this is what you wan to do. 

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