Side by Side installation error?

[peebeds 12]

A friend of mine is attempting to install ARMA2 OA, and keeps hitting a brick wall telling him:

"OA cannot be installed because of a Side by Side installation error" (or words to that effect)

He has followed the repairs suggested on the MS support site (which involve issues with Nero), but still cant get OA to install.

ARMA2 is installed and works fine.

Anyone got any suggestions as to what may be the issue?

Ive suggested he sticks a new HDD in his machine and does a fresh Windows 7 install, then tried again.....but he isnt listening to me even though he works for me, Ive even threatened to sack him if he doesnt get this resolved!!!

Machine Spec:

I7

12gb RAM

Nvidia 570

1TB HDD (93% full!!)

Windows 7 Home Edition.

[BabylonDK 7]

Hmm idk..

Google indicate your friend is missing "VC++".. Try download the application, and retry.

[peebeds 12]

Hmm idk..

Google indicate your friend is missing "VC++".. Try download the application, and retry.

Sorry, I missed that out. He's gone through the C++ stuff (as suggested on the MS support site)