Hard disk beyond 32 GB not recognised

Hi,
Recently I have purchased 80 GB HDD and partitioned 20,20 and 4GB in windows NT 4.0. After commiting the changes and restart it is not displaying rest of the un partitioned space. i tried deleting all the partitions , now it is showing only 32 GB. it is not recognising rest of the space.
CAn anybody help me ??

Regards,
Subhasha H.L