I am not sure what happened to the IE6 bit but I have managed to fix it in an odd approach.
Yesterday I tried uploading by backup which I save every other day when things are working ok. This did not change anything and the problem still existed.
I uploaded the original files from the Webwiz forums zip file but did not do a new install. I tried to access the forum but it couldnt, so I then transferred my backup again on top thinking at least I will have the forum back.
When I went into the forum with IE6 everything was ok!
The only thing I can pin it down to was maybe an original file had gone from my forum so uploading this then the save must have put all back in working order.
Anyway I am pleased I am back on track