The game runs without issue but I cannot get it to run in full screen mode. I tried editing the options.cfg file and manually changed full screen to 1 but now the game won't run unless I completely delete and then reinstall.

I'm not sure of which line in the config file sets the game to fullscreen, but here is something that I previously posted about the file getting corrupted:

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Windows Notepad will TOTALLY COBBLE up your "Options.cfg" file. For some STRANGE reason, the game substitutes Hex(00)s for SOME of the spaces in the file. If you edit the file in Windows Notepad, the Hex 00's are changed to "space" characters, and the game will then choke and crash when started again. To overcome this problem, use the freeware utility "Notepad++" (the forum won't let me post a link <aarrgghh>, use Google for a link to the web page) to edit your "Options.cfg" file.

When loading the "Options.cfg" file into "Notepad++" the Hex(00)s will be displayed with the inverse text of "NUL" in the editor. Don't edit/touch those entries, and you should be OK when editing and then saving the file.
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One of the lines in the options.cfg file says fullscreen=0. Should this be changed to 1 in order to get it to be in full screen?

I used notepad++ but game is still crashing even after a fresh install.

Yes, changing fullscreen=0 to fullscreen=1 should do the trick. I don't know why the game is still crashing, I just happened to remember that thing about using Notepad++ solving the issue for me.