Install 0.74. If that doesn't work, then there's one of two problems here:
1. You didn't install the RTW1.2 patch properly. If it came up with an error saying that the patch was already installed, then you'll need to try again but using the zip patch. Install 0.72 and then patch to 0.74 over that.
2. There was a problem with your download. Re-download 0.72 and patch to 0.74.