as a newbie programmer, there's a VB project done and completed by the developer/programmer in my company just before he left. now there's an error and a need for modification in this already completed program.
now my question is with Microsoft Visual Basic 6.0 how do i load this project do the modification and have it back as an executable program? explain clearly please; i'm not a programmer myself

Moved: This thread is more suitable in Programming and has been moved accordingly to help your thread/question get the exposure it deserves.

This is an odd post? You have a VB app that's throwing unhandled errors? You need to change it but you're not a programmer?

Is your dev environment windows? If so, you should have VB6 or Visual Studio installed, either way you'll need these to access your VB project.
Once you open the project you should be able to run the code in debug mode, make the change and rebuild the project (this'll recreate an exe for you).

I believe GAMBAS and Mono offer excellent Linux equivalents.

If you don't have the source then you're in trouble.

This is too a big a subject to cover in post though..
this looks like it could be of help

http://en.wikiversity.org/wiki/Introduction_to_VB6