Due to the transition to a true 64-bit OS, Visual studio is most likely trying to launch the 64-bit version of IE (which we are not compatible with). To fix this, please do the following:
- Right-click the test project in question and choose Properties
- The next portion will differ depending on whether you are using VB or C#, so review Microsofts article on changing target platform and use the process appropriate to you
After you do this, please re-test your issue. Also, since you are migrating OS's you may also be migrating versions of Visual Studio. One "gotcha" introduced within VS 2010 is that Enable Deployment within the Local.testsettings file is turned off (un-checked) by default. You will also want to make sure to check this box as well if you have not done so already.
If you are unsure if IE 8 has been configured correctly or not, reset the settings to default then follow the instructions in our IE8 setup guide (once you load the page, click the '+' next to Configure your Browser, then click Configure IE 7 & 8).
These will be the most likely items to cause this type of issue after your transition. Please let us know if you still experience issue after doing the above.
the Telerik team