Borderlands DRM problem

[Zadock]

When I first purchased and downloaded the DLC for bordelands it was seamless, not a question asked. then when I reinstalled it recently I had a problem loading Mad Moxxi, which I discovered was a setup program running in the background asking for the CD but it wouldn't load up until it had crashed the game. Anyway so I entered the code, reloaded the game and got the same message so I went into the game files and ran the setup in admin mode, after that all was fine for several weeks... until last night. If I attempt to go to the Mad Moxxi DLC it crashes to desktop, no prompts.

So far I have tried:

1. reinstalling the DLC from the files in the binaries directory, this doesn't seem to work at, all the setup programmes fail to launch
2. running the game in compatibility for XP (as it says in the gearbox forums)
3. Running the game outside steam in administrator mode, game still crashes
4. one or two other anecdotal soltions from the web, including some sort of steam shut down/start up ritual.

I think the only thing left to try now is to reinstall the whole lot from a back up?

anyone else had this problem?

[Phage]

I've been having a few games crash recently. BC2, F3AR and Crysis2. All of whom worked flawlessly previously.
I'm now running them all in compatibility mode with XP SP2 and it seems to have worked. Possibly a windows update has changed something ?

[Zadock]

I've been having a few games crash recently. BC2, F3AR and Crysis2. All of whom worked flawlessly previously.
I'm now running them all in compatibility mode with XP SP2 and it seems to have worked. Possibly a windows update has changed something ?

Possibily, the rest of the game runs fine its just Mad Moxxi and I would imagine Dr Ned as well since they have the same authentication procedure. What do these games have in common appart from Steam? DRM behaviour perhaps?

I'll try the SP2 compatibility rather than SP3 and see if that helps.