Thanks for replying to our issues opjose.

Here is what I have done so far.

Logged in as admin.
uninstalled realflight
searched pc for realflight and deleted all folders and files related.
opened regedit and did a search for realflight. Deleted all enteries for realflight.

Then reinstalled realflight 4 and still get the same error when starting real flight. It happens after the laucher when I click "run realflight"I upgraded to 4.5 with no luck.

I also tried launching from the realflight.exe


Only thing left to do is uninstall and reboot before reinstalling? Will try that.

Edit: I extracted using the selfextractor that came with the file.I entered C:\Program Files\RealFlightG4\Data into the extractor and then the extractor created the directory path for me.Then once I realised the correct way was to import the file not extract, I went to run realflight to access the import and thats when I got the error. After this I noticed that realflight was acually installed under C:\Program Files x86\RealFlightG4\Data. So I deleted the path created by the extractor and on goes the battle ever since.