visual studio .net 2003 won't let me debug

I have break points but it won't stop on them. I know for a fact that the break points are located where it should stop.

Have you got the Build Configuration set to Release by any chance?

No, it's in debug. When I click debug, it will start the application like normal. The only thing that is not happening is that it's not stopping at the breakpoints. There are no error messages saying stuff about symbols not being loaded or anything. It simply won't stop at breakpoint. Though one thing i've noticed, if I set "Properties->ConfigurationProperties->debugging->Enable ASP Debugging", "Properties->ConfigurationProperties->debugging->Enable ASP.NET Debugging", and "Properties->ConfigurationProperties->debugging->Enable Unmanaged Debugging" to TRUE, it will stop on the breakpoint, but I noticed it takes a lot longer to get into debug mode with done this way.

Have you tried with a new application and copy paste you code there?
(or changing your visual studio :o )

I uninstalled .NET framework 1.1 and Visual Studio 2003, and re-installed. Then created a simple "Hello World" project, but still, it won't stop at breakpoint. I also have Visual Studio 2008 on my computer, and it works fine (it stops at breakpoint). Though I have VS 2008, I still want to be able to figure out why this is happening with VS 2003. It's driving me crazy.

Have you installed .net framework and vs2003 service packs?
I don't have another idea.