Only Enterprise edition allows piecemeal restores (a database restored and online with only some of its filegroups). Since you're not running Enterprise edition, you'll need to restore the other filegroups, then restore log backups to bring the DB online.
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