i have followed that and i have updated all my framework things, i updated it all today.
But still i can't get it to work, i have even tried system restores to go back to before the PDN update but it wont let me.
I also tried this from the guide you suggested at viewtopic.php?f=10&t=854
But all this seems to have done is remove it from my 'add or remove programs' and now have deleted the Paint.NET folder from 'program files' so now i am not even getting the error but the computer saying the paint.net.exe can't be found. And also when i try to install the program again i get an error saying something along the lines of, 'This porgram alreayd has parts installed'