Delete the GaW mod. Make sure that all FOLDERS in the data directory are deleted. At the very least, delete the XML folder.
Apply the UNOFFICIAL PATCH for 64 bit windows that corrects this error. Do not use the official one.
Once the patch is installed, you should see a new XML folder in your DATA directory. If you open this XML folder, you will see a few XML files. Copy these to yo0ur desktop.
Install GAW
Take the XML files you copied to your desktop and paste them into the GAW XML folder. click YES to overwrite any files.
This should help with the crashes. Try this and get back to me.