IIRC, your QuickBasic programs will require the QuickBasic interpreter in order to run. Windows 7 64 bit does not come with a Basic interpreter.
Whether or not you will be able to install an old QuickBasic interpreter on Win 7 x64 is another matter. To test, I just downloaded QB 4.5 from my MSDN subscription and attempted to install it on my Win 7 x64 laptop. It fails to install citing the x64 OS
in the error message.