Wdont have manual

Honestly, any USB brand will cut it for you. What you want to ensure is that you are purchasing the proper version (1.0, 2.0, or 3.0) for whatever device the key will be associated with. Also make sure you don't buy too little or too much memory. But if you know all this and you just want a reliable brand, I would go with SanDisk.

WD has a courtesy Drive cloning tool from acronis. It's on their web sit under drivers. Don't worry about the "My Book" thing the file is labeled Acronis True Image WD Edition Software download.
http://support.wd.com/product/download.asp?groupid=132&lang=en

schmuck, under my computer, what does that hdd show?

The electronics in the hard drive is damaged and cannot be repaired by us mortals.
There are companies that can recover data from damaged hard drives BUT it will cost you an arm and a leg for their services.

Try to update the firmware for your WD HDD from computer device manager.

You can download the manual from here.

Copy one of the "music" files from the W.D. to your 'C:' drive.
Then, "play" that copy of it. If it stop/starts/stutters, it's your computer, not your W.D. device, that is the problem.

Otherwise, you have a problem with your W.D. device.

See: http://support.wdc.com/product/downloaddetail.asp?swid=119&wdc_lang=en

and "Download the Data Lifeguard Tools software (Acronis True Image WD Edition and user manual and the WD diagnostic tool)".

Run that WD Diagnostic Tool, to "test" your W.D. drive.
If it "fails" the test, then exercise the warranty to get W.D. to replace the drive.

If the warranty has expired, W.D. has a "Customer Loyalty" program;
buy a new W.D. drive through the W.D. web-site, at a discount.

Or, open the case, remove the disk-drive, and buy a replacement, compatible, disk-drive, and "transplant" it into your case, to revive your external storage device.

files movies support?

You have a bad power supply. You can probably get a new adapter for it.

Western Digital Enclosures are known to have this issue due to the electronics inside. The Hard drive is most likely fine but the electronics that drive the enclosure are not that great.

If it is newly purchased you could return it on warranty or by a new enclosure but buy a good quality one.