*.msi issues

#1
My problem is this; when attempting to install the latest update of java
(version 6 update 16, in either 32-bit OR 64-bit flavours)
i recieve the error message:

Windows Installer
This installation package could not be opened. Verify that the package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows Installer package

a search on this error message has turned up many many problems ranging back to xp, so i think i may be out of my tech depth here

I recieve the same error message trying to install Steam using the installer, however i was able to unpack steam using winrar but attempting this with java yeilds more error messages

I am running Windows 7 Home Premium on a machine i built myself, can provide spec if required

Help would be greatly appreciated
 


#2
if more information is needed please can you let me know which info here are the system info specs
6.1.7600 build 7600
windows 7 Home Premium
GA-MA770T-UD3P motherboard
AMD Phenom II x4 945
2x 2GB 1333Mhz
 


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