I am assuming based on the path you are using windows xp.
Can you verify there is a file @ C:\program files\virindiplugins\virinditank\utank2-i.dll. If it is not present that is likely your problem, if it is there, try renaming it quickly to ensure the file isnt locked, if it is attempt closing all your clients, if it is still locked, reboot your pc and hope it unlocks. If it doesnt, do a repair or reinstall of the virindi tank bundle (ensure to save your nav/loot profiles, not sure if it is done automatically or not).
-----signature-----
Paud Gorfo Mage HG L180+
Lyere Dunois Archer HG 200+
Proud member of Rune of the Icefalcon