So you have now installed RTW only? If so, there's the method of stubborness:
restart your PC, try again;
if still no luck -> uninstall RTW with the uninstaller, if you haven't patched it;
-> restart your PC;
-> re install RTW;
-> check if it works;
If so: continue by patching it to 1.5 if it wasn't 1.5 already;
If not: try again;
If you have your RTW working and patched to 1.5: on to installing EB;
Check if it works now;
If not: on to step 1 again...

It's tiresome... but as soon as you've managed to get EB to live on your PC... I think you'll find it was worth it.

And: DO NOT BOTHER WITH BI. When you get tired/ bored of EB (IF you ever will), uninstall the whole lot, reinstall all of RTW/ BI you want.