http://sourceforge.net/projects/bitcoin/
If you don't want to download Gigabytes of the whole bitcoin blockchain, then run the wallet once after installing it, and close it right away.
Click the windows start button, and type this into the search box, and press the enter key
%appdata%
A folder should open, and you should be able to find a bitcoin folder inside it.
Open the bitcoin folder and replace the wallet.dat already in there with one of your wallet.dat files containing your bitcoins
Run the bitcoin software again, when it opens make a note of your bitcoin address in the receive window
Click help, then debug window, then click the console tab
At the bottom of the console window type
dumpprivkey followed by a space, then type your bitcoin address that you copied from the receive window
Press enter and copy the long string of letters and numbers shows in the console window (that's your private bitcoin key)
Install multibit, run it
Follow this tutorial to create a file needed to import your private key into multibit
https://www.multibit.org/v0.5/help_importASingleKey.html
Select tools from the menu at the top
Select "import private keys" from the "tools" drop down list, click the "import from" button, and select the file you created from the tutorial
Your bitcoins should show up in multibit after it has synced
You will need to repeat these steps for all your wallet.dat files.
Good post but you missed one thing, most important thing. "Multibit wallet.dat file is incompatible with Bitcoin core and vice versa". CMIIW.
@OP: Download Multibit and open that wallet.dat files from Multibit and see whether you can see the balance or not.
As I stated earlier, multibit does not use or create wallet.dat files. It stores bitcoin keys in files with .info and .wallet extensions, and also a folder with a name ending in -data.
Multibit does not create a wallet.dat file to store bitcoin keys in, it creates files with .info and .wallet extensions, and also a folder with a name ending in -data for each address.
.....
IIRC Multibit(maybe old versions) do create wallet.dat files and they were different format than Bitcoin core. OP got wallet.dat from Multibit too and if it is true, it is incompatible with Bitcoin core.
-snip-
Sorry, I didn't know that very old multibit clients used a different wallet format to the current one. However, the user in the quote below seems to be confusing multibit.wallet files for wallet.dat files, and I expect it's quite a common mistake.
You can find more direct help on this dedicated MultiBit forum: https://bitcointalk.org/index.php?PHPSESSID=v4lefhogmd58oe85n56ko06914&board=99.0
And the MultiBit web site has thorough documentation, as well: https://multibit.org/index.html
Thanks for the reply, i did notice other untitled wallet.dat files in the Multibit folder (even though i have named my wallets Wallet1, Wallet 2 etc), i will just back up EVERYTHING in the folder then to be safe.
So it looks like i will have to open every wallet.dat file if i do a recovery....
Cheers