How do you update SQL2008 Express to SP3

I installed SQL2008 express and when I try to install SP3 it wants to install a new instance.  Can't the existing version be upgraded?
J.R. SitmanAsked:
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venk_rConnect With a Mentor Commented:
May be you have the full installation running.Try the below link for sp3
J.R. SitmanAuthor Commented:
Perfect.  Thanks
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