How to repair Visual Studio 2010 after broken installation of Async CTP

When I try to install the Async CTP for Visual Studio 2010 the installer fails.

I got the same problem bob mujica described in http://social.msdn.microsoft.com/Forums/en-US/netfxsetup/thread/2b816f97-ba1a-4342-824f-07c53f946b57.

Now Visual Studio doesn't work at all. I don't care abo开发者_运维百科ut having CTP, I just want Visual Studio back. Does anyone know how I can do this?

Ian,

I know it won't help in this scenario but a little advice for the future that could save a lot of heartache. for the past 7-8 years, i've got into a disciplined habit of making a fresh backup (ghost) of my program partition (genarally the c:\ drive in my case) everytime i add a new program feature (other than service packs etc) to my installation. This basically means that should something 'not work' after installing, I can simply restore the ghost image over the top, rather than spend hours trying to figure why.

As i said, may not help this time but is a good discipline to work towards in the future.

My recommendation would be to install a fresh copy of Visual Studio, or perhaps to copy files from a fresh installation to overwrite any updated libraries. Assuming that you have the installation media you could also try to repair the installation from Control Panel -> Programs (Add/Remove Programs if you're still on XP).

From the linked post it sounds like either (a) a library file has been overwritten with an incompatible version or (b) a library file is referenced but not found on the system. (a) likely can be fixed by trying any of the above. (b) most likely requires VS to be removed and reinstalled from scratch. If you have a second machine around, you could try installing VS on that and dump or record the relevant registry changes and compare it with the faulty installation, but it might be faster just to reinstall.