Power Tab Editor is a tablature authoring tool for Windows.
Use it to make guitar and bass tab (tablature).
It lets you create tabs with most of the symbols usually found in tablature including chord names, chord diagrams, rhythm slashes, bends, slides, hammer-ons/pull-offs, harmonics and even palm muting.
It's a great application for people who want to learn how to play guitar, and indeed seasoned pros who need to transcribe their own music and/or guitar lessons.
If you are looking to convert Power Tab to Guitar Pro there is no longer any need because Guitar Pro now imports Power Tab.
Although PowerTab is not officially designed to run on Windows Vista, there are a lot of people who use it with no problem, however some people have reported that it won't run on Vista for them.