Sorry for the crashing! I haven't encountered that error. It could be something related to Windows 7 (There's some compatibility stuff fixed in Windows 10), or another application affecting NOLF (like a third party anti virus, rivatuner statistics server, or a overlay.)
Unfortunately there's not a lot I can debug here. I've fixed quite a few bugs for the next release which might help but that's still a bit aways.
Are you using an official disk install or the nolf revival release? I've developed some of the fixes off the no cd patched exe so having the original release run might cause some problems. (I'll be bundling it in with the next release.)