:D
Welcome to user access control :) Long story short, this is a known issue for software developed on VC 2005, among others.
You can bypass this problem by running the following command in an ADMIN command prompt (Right click - Run as Administrator On the Command Prompt link) - I would recommend copying the installer package to a folder on the root of the drive so its easier to "cd" to it from the command prompt.
msiexec /i YourApplicationInstallerName.msi
Wher
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YourApplicationInstallerName.msi is the name of the package you are trying to install. Obviously you will have to use the command prompt to get to the folder the package is in before running the command.
Eg : Your package is XYZ.msi, You have saved it in the "Temp Install" folder on the root of C drive
Open an Admin command prompt
Type commands :
cd \
cd "Temp Install"
msiexec /i xyz,msi
RB.