"Launcher has stopped working"

[mdgtmstng]

Ok, so I just upgraded to an Nvidia GeForce GTX 580. Before, I was using a 9500GT card and was able to fly the sim (at low gfx settings). Now, when I load a flight (i.e. solo flight in training), the progress bar goes across, and I see the cockpit for a moment, then get a box stating that "Launcher has stopped working". The details given are:

Description:

Stopped working

Problem signature:

Problem Event Name: CLR20r3

Problem Signature 01: launcher.exe

Problem Signature 02: 1.0.0.0

Problem Signature 03: 4d6e3d08

Problem Signature 04: core

Problem Signature 05: 1.0.0.0

Problem Signature 06: 4e047eee

Problem Signature 07: c75

Problem Signature 08: 8

Problem Signature 09: System.AccessViolationException

OS Version: 6.0.6002.2.2.0.768.3

Locale ID: 1033

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Anyone have any ideas why this is happening?

Thanks for any help.

Ed