Windows 7 unfinished decrypting hard drive by bitlocker

[clear08]

i got an unfinished decrypting hard drive by bitlocker in windows 7. i decide to reformat my computer because it always crash or freeze. i reinstall windows 7 but every time i plug in the hard drive, my computer freezees. even in booting. how can i recover my files from that hard drive. any1 pls help me