OK, first of all - the "Out of memory" problem fixed and the new version is available for immediate download here:
http://www.exisoftware.com/url_generato ... _setup.exe
Now about your project. The settings you provided would generate 561,330,008,019,000 URLs. This is too much for the current version of the program. Maximum number of URLs it can generate in one project is 2,147,483,647.
Also I doubt any directory would easily hold 70000000 images - and this is exactly what you were trying to generate (varying number #4). So please check out those settings and reduce the numbers.