Massive PC file name conversion?

[SzczerbiakManiac]

I have about 1500 files and I need to make two tweaks to all of them:
Convert all underscores to spaces
Delete the last five characters, not including the extensionE.g., If a file was named "Image_File_Name_2012.jpg" I want the new name to be "Image File Name.jpg". I don't mind making two passes, one for each action, but I do NOT want to manually edit each file.

Is there a way I can automate this process?

ETA: I'm running Windows 7

[Ghoulish Delight]

windows? are they all in one directory?

[Alex]

There are good batch renamers out there. I've had good luck in the past with D-FileMU but I don't know if there's a Window 7 version (though it might work anyway).

Rename Master (http://www.joejoesoft.com/cms/showpage.php?cid=108) is also decent.

[SzczerbiakManiac]

They're all in the same directory.

I'll check out Rename Master, thanks Alex.

[SzczerbiakManiac]

Alex you rock! Rename Master does exactly what I needed.

I owe you some Love Brownies.

[JWBear]

I owe you some Love Brownies.

That sounds disturbingly scatological.