Please post query, execution plan, table definition, index definition.
Also, ask yourself if the scan is a problem before you spend any time thinking about it.
http://sqlinthewild.co.za/index.php/2010/03/11/the-root-of-all-evil/
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability