Is it necessary to update to .NET framework 2.0?

I am currently have MS Visual Studio 2003 with .NET framework 1.1 Is it necessary to update to 2.0? if so, how can I update it?
I dl from this microsoft site, but can't install.
http://www.microsoft.com/downloads/details.aspx?FamilyID=0856eacb-4362-4b0d-8edd-aab15c5e04f5&displaylang=en

help please!

No. If you're using VS 2003 then you need to stay with 1.1. If you are using VS 2005 then you go to 2.0.

The development tools are pretty tightly coupled with the version of the Framework.

In addition, there are some other things that you need to do with the Application Pools on the server if you want to run apps from both versions at the same time.

In addition, there are some other things that you need to do with the Application Pools on the server if you want to run apps from both versions at the same time.

so what is that application pools?

Currently, I have hosdepot.com host my website. If I add my web-based application using ASP.NET 1.1 framework, then it will not be a problem right? because I assume the hosting company will have all the tool for it to work.

I am so new to this stuff.

If you're using a host, then you shouldn't have to worry about it. They'll tell you which version they support (or both). Somewhere in the control panel they provide, you may have to select which version of the framework that folder uses.

Unfortunately every host sets up their interface a little bit different.