Hello guys...i have problem with crysis patch..

when i want to install patch 1.1 it says

the upgrade patch cannot be installed by windows installer service because the program to be upgraded may be missing or the upgrade patch may update a different version of the program.verify the program to be upgraded exists on your computer and that you have the correct upgrade patch

and when i want install patch 1.2 it says

an error occured installing the package.windows installer returned.'1642'

please help me..
tnx