I suggest you use Partition Table Doctor to resolve your
problem.The software provides very useful functions:
Backup partition table, Restore partition table, Rebuild
partition table, undelete partition, Fix boot sector,
rebuild mbr,etc.
First thing I recommend you download the demo version of
Partition Table Doctor.(
http://www.ptdd.com/download.htm )
Run the program and select "Rebuild Partition Table",
then choose "Interactive" mode. If you can find the partition
you need, that is Partition Table Doctor can help you. Otherwise,
Partition Table Doctor cannot help you.
See more:
http://www.ptdd.com/recoverylostpartition.htm
http://www.ptdd.com/recoverdeletedpartition.htm
http://www.ptdd.com/partition-recovery.htm