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If your program is not opening but says it's running, open Task manager, you will see the icon, expanded it and left click on the icon. Tom Johnson

Not able to edit. But I did find out what my problem was. I did a new extract of the PMDG 777-300 zip file and deleted the old extracted file and everything is working ok. While installing the first extracted file it must write back to the file where the P3d program is installed. Tom Johnson

PMDG order ID # 310383 Order Date: 3/6/2015 I too am having problems installing PMDG 777-300 using P3D. I am able to install PMDG-200 and activate but when trying to install PMDG 300 after flying the 200 I get the following: Installation cannot continue. Your registry does not show a valid Prepar3d installation code. I know P3d v3.2 is registered since I put my codes in and have been flying for awhile. I read the install files about moving the P3D folder. I reformatted my computer and I have the same problem. I installed in the default folder and also installed in the C:/Lockheed/P3D folder after reformatting three times. Tom Johnson

Follow up on my 777-300 installation. Removed P3D 3.1 Professional Plus and reinstalled P3D 2.5. Installed to C/LockheedMartin. Works great. A shoutout to Lockheed Martin since they refunded my money. Tom Johnson

Thanks Tom Johnson

Tried to respond to your questions but will not let me post. I only have P3D V3.1 installed. Do not have Estonia installed. Did a complete format and still have same problem. Guess I could re-install P3D into the default program. Checked that Norton is not letting me install. It was blocking my Multi Crew install. Also do you all use a better Co-Pilot than Multi Crew. Not that I don't like it, I am always looking for the best thing out there. Thank You Tom Johnson Also it does not show where my P3D is installed. It just switches to the message can't find my installed program in the register.

The following is a problem that I just started to have after installing P3D v3.1 Professional Pro. I installed P3D into C/Lockheed Martin. I download the new update installer for the 777 200 and the 777 300. Installed the 777 200 and activated. I ran P3D once flying the 777 200. I closed the flight and P3D. I tried to install 777 300 three times and got the same message: Installation cannot continue. Your registry does not show a valid Prepar3D installation location. At this time I reinstalled P3D using the repair install. I got the message that the repair install corrected all the problems. I am still not able to install the 777 300 even though 777 200 works great. Tom Johnson