Error shown during installation using windows 7

Hello guys,
I am using windows 7, but whenever I try to install, I get the following message:
It mentions E drive, but that doesn’t exist!
Please see below for a screenshot.

The File ‘E :ProgramsPACIFI~1 Unwise. exe’ could not be opened. Please check that your disk is not full and that you have access to the destination directory. The system cannot find the path specified.
OK
Any help will be appreciated.
Thanks.
