We are looking for a private driver/guide for sightseeing in these areas.

Also we would like private driver from Munich to Vienna.

Thanks,

Jennifer

http://www.airport-shuttle-munich.com/index.htm

We were pleased with John's Bavarian Tours and used John as our driver for a full day of touring from Munich.

What's your budget?

Hopefully your budget is high because this is likely to cost an arm and a leg.

It is high.

We also need from Budapest to Vienna

Any reason why you don't take the train on the long-distance routes? It is faster and far more comfortable than any car.

Maybe I do not understand your question properly:

If you want to explore the sights in between Munich and Vienna, and in between Budapest and Vienna, a private car with driver could be a nice option.

But if you simply need to go from A to B, then the car will be less comfortable and the slowest option as quokka said.

If money is not your prime concern, you could check out the "Premium Class" on the "railjet", the flagship train of Austrian Rail which connects Munich with Vienna and Budapest.
http://www.oebb.at/pv/en/All_about_T...ljet/index.jsp

Premium Class on RailJet is fabulous! We were on one of those trains last year and walked through the cabin and it was really something.