uninstall/reinstall help

Hey guys, I've been having problems with TS2015 crashing when I'm in editor mode, specifically when I'm painting ground textures. I've searched several times for the PONtracks.bin files that I've read so much about, but have found nothing. I upgraded my graphics card to a radeon HD 7800, while it has made the sim run much smoother still did not fix the railworks.exe has stopped working msg.. I've validated my files dozens of times still no fix.
I think my only other option might be to do a reinstall. Since I have hundreds of files and upgrades from 3rd party creators installed, I've avoided the reinstall. My original CD is TS2012 and have just gotten the automatic upgrades since then. Can anyone walk me through the whole process? I have a route that I'm working on and don't want to lose anything.
My system is an HP Pavillion with a 1TB AMD 6 core processor, 6GB hard drive and a Radeon HD 7800 graphics card. I'm at my wits end.
I think my only other option might be to do a reinstall. Since I have hundreds of files and upgrades from 3rd party creators installed, I've avoided the reinstall. My original CD is TS2012 and have just gotten the automatic upgrades since then. Can anyone walk me through the whole process? I have a route that I'm working on and don't want to lose anything.
My system is an HP Pavillion with a 1TB AMD 6 core processor, 6GB hard drive and a Radeon HD 7800 graphics card. I'm at my wits end.
