Have a 2400 series all in one can\'t find driver

Have a 2400 series all in one

You did not post the brand name or the complete model name, so I'm guessing it's a Dell Dimension 2400?
If it is, there is bad news - there are no Windows Vista drivers for that model. Dell have never released any.
You therefore cannot run Windows Vista on your Dimension 2400.

If you mean an HP 2400 printer/scanner, the drivers are here: http://h20000.www2.hp.com/bizsupport/TechSupport/ProductList.jsp?locale=en_us&taskId=135&prodSeriesId=303752&prodTypeId=18972

In future, please post the full brand name, model number and device type so we don't have to guess what it is.