There are two issues:
1) You say you removed BI. Apparently you were using BI.exe for running EB, right?
2) Do you still have a copy of RTW patched to at least 1.5 which hasn't been tampered with?

1) Yes: for safety, uninstall EB. Reinstall EB.
2) No: Install a copy of RTW 1.5 or higher first before proceeding with (un)installing EB.
2) Yes: use that copy for reinstalling EB.

To find *all* RTW.exe's lingering on your HD, you just need to open WindowsExplorer (My Computer) or any similar program you have and search for RomeTW.exe.

(With XP or previous versions of MS Windows, you can probably find it somewhere under Tools or Options or sth like that. Consult the built in help function if you need help there, it provides you with very detailed and usually fool-proof instructions.)

(With Vista you need not neccesarily go into the Windows Explorer: just hit start and type RTW.exe in the search field. Alternatively you can make use of the search field in the Windows Explorer.)