SP2 RTM will install over previous builds- but i found that some bugs were carried over from the previous builds. For example, on builds 2162 and 2179 i couldnt right click a file without drwatson32 crashing explorer, after an update to rtm the bugs were still there. To uninstall previous builds go to control pannel, add and remove programs, make sure the "Show Updates" checkbox is ticked and then simply chose the sp2 update and remove.
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