Any partitioning, repair, install or upgrade needs to have the data backed up first.
In the future use free Partition Wizard bootable CD which protects data as it moves it.
You can try free Paragon Rescue disk to see what partitions or files it can recover - google it..
But most likely you'll need to try free Recuva Data Recovery software to try to piece back together what files it can. Be sure to read the Help files while it is running, which takes awhile. You need to be up to speed to know how to deal with what it finds.