Do you have to have ODBC

Not unless you intend using a data base. All these things you talked about are associated with importing and exporting data.
However, dont just delete these files in explorer - you need to uninstall these options from the program that installed them in the first place (usually something like Microsoft Works or Microsoft Office or one of their components.
Peter

if you don't use it it's unlikely you experience issues with it. Tell more on that.

Dial-up connections don't come out of the blue. Either you have a socalled dialer (nice software dialing expensive numbers to rob you), which you should remove, or you left a setting somewhere in Internet Options to use a dial-up for connecting. Try downloading Adaware and Spybot (both free) to check for dialers.

Kees