IIS is not installed ,because the files are not found staxmem.dl_.

1. Click Start Menu>> Run>> type cmd.
2.Type the following command, and then tap Enter.
esentutl /p %windir%\security\database\secedit.sdb
3. the warning window comes up, press OK.
4. and then wait until the system is "Repair" finished

Now go back to install IIS again.

Reference: http://www.memo8.com/toolkits/archives/92