ORBX/FTX Problem... (Radio Buttons 01) + How to Use FSX Registry Utl.

Yesterday I finally bought Palm Springs Intl from the ORBX/FTX website. Then, while running Setup an error showed up. It said:

Radio Buttons 01 > On Next, Line 10: Argument 2 must be of type string.

Stack Traceback:

[Radio Buttons 01 > On Next] Line: 10 in main chunk

So why is this? In another thread, I learned you're gonna need FSX Registry Utility by TweakFS.

Which is located in here: http://flyawaysimulation.com/downloads/files/18872/fsx-tweakfs-registry-utility-v121/"]http://flyawaysimulation.com/downloads/files/18872/fsx-tweakfs-registry-utility-v121/

But my REAL problem is this:

How do you use this .exe file?

Once I opened it, I click Get FSX Path.

Other solutions just to solve this problem like running another program or changing dll files or what ARE OK. As long as it doesn't tell ME to REINSTALL FSX.

My Questions:

1. What do you click? (CURRENT_USER) or (LOCAL_MACHINE)?

2. Let's say I chose LOCAL_MACHINE. I then click SET FSX PATH in the next Tab, but then it says that I need to go to the GET FSX PATH tab to verify it. After the verification, When I run the Setup for the ORBX/FTX, Still the same problem.

Please don't tell me I HAVE TO REINSTALL FSX. That took me about a 2 days running about 25 Setup files. K, then. Thanks in advance for your answers. :)