I'm completely stuck on this issue that keeps reoccuring for my organizations Sharepoint Administrators.
On a Site Page under Site Actions, selecting the option 'Edit in Sharepoint Designer' opens the Site Page in MS Word and then displays a 'Install Sharepoint Designer 2010' popup box.
Sharepoint Designer 2010 is already installed, the option to launch Sharepoint is enabled on the Admin Site. Using IE8 on a 32-bit OS (No option at all for 64-bit IE to open up). Default HTML editor is set to Sharepoint Designer (playing around with these options don't change the result).
Have previously attempted reimaging the machine, running a repair over SP2010 and reset, but the issue keep reoccuring. Has also been reported that this is only happening to a couple of our sites where others were working (same configuration, same computer, same user).
Launching SPD2010 from the start menu then openning the sites that way works fine and is the current workaround for the issue while I investigate.
Anyone able to offer any advice? Have hit a wall with this issue.