Your screenshot looks normal. It looks like you are viewing the Bass track, and there doesn't happen to be any notation on the bass. The Slashes are just a way of indicating that it is an empty bar. There is a setting to show/hide slashes in the notation window options.
If you generated a RealTrack and there is no notation showing, this is because that particular RT does not have a transcription (RealCharts) available. This is the case for some of the older RT's. In the RealTracks window, there is a column "Chart", and it is either blank (no notation), N (notation), or Gt (notation, including accurate tab for guitar/bass).
really hope I dont have to download and install all this again?
You should definitely not do that, and there would be no point. If you WERE having a font issue, there is a small font installer in the Band-in-a-Box folder you can run (C:\bb\Data\Installers\bbfonts.exe).
Just to be complete, the error message (error code 5) typically means that a file (in this case, likely the font file) was open/in use when the installer was trying to replace it.