Add-in Valkyrie.dll Problem

Anyone know how to resolve the following issue?

The add-in "enterprise vault" (c:\enterprisevault\evclient\valkyrie.dll) cannot be loadded and has been disabled by Outlook. 

we have disabled the account from archive and did uninstall of the evclient, reinstalled to no avail. 

XP sp3, ev8 sp2

thanks