Ok, what happened to the original question? Got the same problem, cant use "paste as plain text" in IE8.
I to get the access clipboard popup, and if i ok that one nothing happens.
Also if i click "paste as plain text" again, i get a link or junktext like Bw8Y*SxwYE-%P% inserted in my editor.
This was noted by one of my customers on a 64bit system but I get the same behaviour on my 32 bit system.
/Bix