I had the same problem. My C # projects were under XPsp3. I installed Win7, then Vis Studio 8 SP1 and other development tools. Opened my projects in C # and got a Save As. Problem, try it, it worked for me.
Make sure you are using Visual Studio as an administrator. To do this, create a desktop for Visual Studio 2008. Right-click on it and select "Properties." Then select the Compatibility tab. Below, under the Priviledge level, make sure that you run the program when the administrator is verified. Select the OK button. Launch Vis Studio again
Also try
1) Open the Visual Studio command prompt 2) Then do the following: devenv / ResetSettings.
source share