SQL Error

Hi,
I’m very new to SQL. I’m running sql 7.0. When I
optimize the database I get the following error:
Error 1105 [sql server] could not allocate space for object (table_name is here) in database because the primary filegroup is full…Is therean easy solution to this.Any help would be appreciated…… I tried the command below but still received the same results

EXEC sp_spaceused @updateusage = ‘TRUE’