Please help me !!!! cant install programs

hi
i am new here so please excuse me if this is in the wrong section.and sry for my bad english... english isnt my firs language

ok my problem is that when i want to install programs eg: call of duty modern warfare 2 , vegas 9 pro ... it starts installing but before the real instalation starts it opens a messagebox saying :

Microsoft Visual C++ 2005 redistributable

The feature you are trying to use is on a network resource that is unavailable.

click OK to try again, or enter an alternate path to a folder containing the installation package "vcredist.msi" in the box below

if i cklick ok it just pops up again

i know that modern warfare should work on win 7 because a friend of mine also has it on his pc which runs win 7

here my hardware / software details :
grafik card ATI 4850
motherboard sli-m2n Deluxe ( from msi )
6 gb ram
1 external harddrive 1tb
1 internal harddrive 372 gb
win 7 86 bit

please help me !!!!
i realy like win 7 but i realy get anoyed that i cant install some programms
thx

ah i forgot ...
when i then click cancell it says :

Microsoft Visual C++ 2005 redistributable

Error 1714. The older version of microsoft C++ 2005 redistributable cannot be removed . contact your technical support group

hi FZ21Z
when i try to install the file you posted the link to it comes up with the same problem

i could install this one but the problem still apperars when i try to install certain programms

Have you tried removing the Visual C++ runtimes from the Programs and Feature control panel?

Just a guess.

no...
how do i do it ?

ok thx
i will try that