LuminaryJanitor

1.3.5. I cleaned out everything I wanted to with 1.3.5, then used 1.4 for the handful of new removal options, and it installed fine, so it looks like it's one of the old options messing up the 1.4 install.

Same problem here. XP Pro, SP2, Xable's update, DX9c addon. Narrowed it down to something removed in the OS options or network sections, or perhaps WMP (gave up once I found out it works fine in 1.3). BTW, the first time I encountered this, it installed in VirtualPC - though "Saving Settings" took about 20 minutes - but sat there forever when I tried to install it for real...