I can confirm that installing those allows WallMarket 1.4.5 to work flawlessly under Windows 7 64-bit (I installed "Visual Basic Power Packs 3" and .Net 4.0.)
And the reason I'm replying to an old topic: This is the specific post that Google led me to when I was looking for a solution to WallMarket crashing, to see if it was still available / updated. Specifically, I searched for, without quotes:
WallMarket Windows 7
So... Anyone who also arrives here via Google, rest assured: WallMarket is alive and well, works beautifully, just install those modules.