If the table is clustered (has a non-clustered index, then you can try a DBCC DBREINDEX (tablename,'',100). The '' specifies to reindex all indexes on the table, and the 100 specifies to completely fill the data pages when done.

If not, then create a clustered index on any column, specify a fill factor of 100. After creation you can drop the index.

Unfortunately, this process could take a while on a 100GB table.