Comment 45 for bug 365881

I think this bug is due to mounting or running the cd/ iso image from multiple drivers.

1- un install wubi
2-check in windows by writing in RUU:
%temp%

and clear all files

restart and try again.

i did it this way and it works.

P.S:
make sure that there is no ISO images in the root directories of the partitions e.g.(C,D,E,F,...etc.)