No - the component and pcb file structure in @llegro is entirely different from Protel. There is no converter available that will allow you to go back and forth between the two software packages. The suggestion above to use Specttr@ only gets you the net configuations, not the physical PCB layout.
This is a frequently asked question, and some people have claimed there are ways to do it. However, none of those who claim it can be done have ever actually done it.
Unfortunately, this conversion cannot be done. If you want the board in @llegro, you will have to reconstruct it from scratch. You can't do it in Pr0tel, then convert it to @llegro - or vice-versa.