unable to upgrade exchange 2007 SP1 to SP2

error message:
exchange 2007 sp2 setup previously failed while performing the action install.you cannot resume setup by performing the action buildtobuild upgrade
Resolution:
Go through the following registry keys and delete all the “Watermark” and “Action” items. The install will proceed successfully.

HKEY_LOCAL_MACHINESOFTWAREMicrosoftExchangev8.0AdminTools
HKEY_LOCAL_MACHINESOFTWAREMicrosoftExchangev8.0ClientAccessRole
HKEY_LOCAL_MACHINESOFTWAREMicrosoftExchangev8.0HubTransportRole
HKEY_LOCAL_MACHINESOFTWAREMicrosoftExchangev8.0MailboxRole
HKEY_LOCAL_MACHINESOFTWAREMicrosoftExchangev8.0UnifiedMessagingRole
HKEY_LOCAL_MACHINESOFTWAREMicrosoftExchangev8.0ClusteredMailboxServer
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