Hey,
I have the same problem. My belief is that when the program
closes, it writes to a file somewhere, maybe a dll or something but
the file is still being used by another program, or something
similar. This would explain why it can't be written because
something else has ahold of the file it wants to use. The error
seems to occur whenever acrobat reader is used. Ex: Web browsing,
open pdf, or offline when you just view a local pdf file.
I hope someone else can contribute a fix.