Maximum PC

I have a Western Digital Cavier blue 1 TB that I pulled out of an HP simple save usb 2.0 enclosure because it wasn't showing up in 'my computer' Computer management wants me initialize the disk, I'm worried that it will wipe all my data. I'm looking for a free program or utility that will allow me to recovery my files or my partitions. What do you guys recommend?
I'm running Windows 7 x64

If your partition is corrupted, you might be able to fix it with TestDisk. It's a bit "primitive" to use (last I used it, it was CLI only), but it's a start. And I think it has a Wiki with tutorials to guide you through what you need to do.

Did you try checkdisk? chkdsk c: /r

Any case of abnormal data corruption in Windows FAT & NTFS file systems can cause data loss in the data residing in the hard disk of the computer. The easy way to revive the lost data is to use an efficient Windows recovery software. Kernel for Windows Data Recovery is such a data recovery software that revives all lost, formatted and permanently deleted files from hard disk drive. It supports both FAT & NFTS file systems.

It may be your enclosure that is bad. Take the drive out and hook it up normally right to your motherboard. If the drive shows up, you know the issue is with your enclosure.

Nasty