Why does my interface look like this when I render, and why can't I see the text in the "error message" box?

Damn....I just had that problem a few weeks back and posted it here. No one said they had seen it before, so I felt it was some weirdness of my own machine. I wish I could tell you exactly what I did to cure it, but I kept messing around in many ways. Reinstaling didnt seem to help, so what I did was clean up the hard drive. I archived the old files (all those props which I wasnt using) on cd, then cleared the space on the drive (even though there was 2 gig available anyway), then a defrag. Then I went away on a weeks vacation (I think that part could be optional :) )...and it seems to work fine again now, so I didnt question it :) I seriously think it was the defrag that helped. Rawn