Normally when you merge partitions with PQMagic it puts the files from the second partition in a folder on the first partition. However, if it didn't and you have not over-written the Unallocated space, you can find an old version of Norton's version of Check Disk and run from a command prompt, it will find and allow the restore of previously available partitions.
There is also a company that has a product (EASEUS) that does specific things such as recovering deleted partitions. http://www.ptdd.com/recoverdeletedpartition.htm
Which provides EASEUS Partition Recovery - Free.