I'm not sure what happened. I was running SharePoint Designer 2010 just fine until yesterday afternoon. Yesterday I was trying to clean off my desktop and reorganize my folders. I may have removed a file that was necessary. I'm not sure.
Now I'm getting this error when I try to open a page from SharePoint through Site Actions> Edit in SharePoint Designer.
Also, the Microsoft Designer download comes up. I've tried to uninstall SP Designer, and reinstall it, but I'm still getting the same error. If I select No in the dialogue box, it comes up again the next time. If I select Yes, it opens the Notepad and saves it to my desktop. I can still access the SharePoint sites when I open SharePoint designer from my computer, I just can't access the SharePoint Designer when I am in SharePoint and select "Edit in SharePoint Designer." Any thoughts? Thanks.