How do I convert wide screen footage to the 4:3

Hey there. I haven't done event videography for a few years.
A friend of mine asked me to videotape his sister's wedding. I videotaped it using the Canon GL2 camera. He videotaped it using some consumer Sony camera which captures in the 16:9 format.
Footages from both cameras were digitized.
I have Canopus DVStorm and Premiere 6.5 which are compatible.
I also purchased PPro2, which is not compatible with DVStorm
I also have Canopus Procoder 2 which converts from 1 format to another.
When I imported both my and his digitized footage into Premiere 6.5, and previewed the video on my monitor, my footage appeared fine in a 4:3 format, whereas his footage appeared in the 16:9 format on the 4:3 screen.
I tried converting his footage in Procoder to Canopus AVI1 720x480, and still has the black frame on the top and bottom when previewed on the monitor.
I tried the transform function in Premiere, stretching the height and width to 120%, and this ends up in the footage looking very grainy and blured.
How do I effectively convert his footage to the 4:3 proportion without loss of quality?