When attempting to install the SQL Server 2000 SP4 update to a Virtual SQL Instance on a 2003 Active/Passive Cluster I get a failure message after inputing the Remote Access account details. This Remote Access account used has Domain Admin Rights, Has all the required Local Policy Settings, is also the Owner of the SQL Services, and the Cluster Service. But still the installation fails to validate the account. All Cluster Nodes, and Resource are Active and Online. The installation process successfully takes the correct SQL Instance Resource offline to start the installation. But then fails, as if it does not like the Remote Access Account. Note that the account was used quite happily for cluster installation and maintenance up to SP3a. Any ideas?