Program crashes at Sun Position Calculator launch about tonatiuh HOT 2 OPEN

Back with an update:

I've uninstalled the win7x64 2.0.0 version, cleaned my registry with Ccleaner, 
deleted the C:/Tonatiuh folder manually and then installed the win7 1.2.6 (x86) 
version. The calculator was able to launch within an empty file with only sun 
defined as pillbox. Then I closed it, opened another file that is downloaded 
from tutorials page, and there it was. Calculator failed again. And it's unable 
to launch in any circumstance, including the one that I was able to launch 
before...

Well, for sake of the problem to be solved ASAP, another update. On win7x64 
1.2.6 just a moment ago, calculator has launched without problem. I closed it 
and re-launched it without making any changes, in the same file without exiting 
the program, and it failed again... This just doesn't make sense to me... I'm 
desperately in need of help. Thanks in advance.