Can you still boot into the original 32 bit OS? If yes, then use the W7 Easy Transfer Wizard to get the files you want off that drive and restore them to your 64 bit system.
Note: Data files only, any programs will need reinstalation.
If the the 32 bit OS is not Windows 7, then use your W7 dvd.
To use the W7 Easy Transfer Wizard:
Browse to the DVD drive on your computer and click migsetup.exe in the Support\Migwiz directory.