Write c: \ Windows \ Unist.ico Error

Huangshan in IE to install software to repair experts, “write c:\ Windows \ Unist.ico There was an error, whether or not to terminate the installation of the software.” Points can not, after installation, installation can also use the software, but every time the software to open When prompted all system files have been destroyed.To close the dialog box after the continued use of the software.This is what I would like to ask the question?

Vista system?
This is the written authority, the authority to run the installation program can not be carried out into the windows folder.
Administrator rights to run the installer should be able to solve the re-installation.