Why can't I install my Kaspersky antivirus on my windows 8.1 pro based computer?

[Karthik Sridhar 2000]

I have a boxed version of Kaspersky internet security 2014. I don't have a CD-drive. So, I copied the whole content in the CD with my laptop and tried to install it on my computer. It starts well and goes on well. but in the middle of installation, it says "Current operating system is not supported". My operating system is Windows 8.1 pro. It also stated in that box that it is "ready for windows 8". don't know what to do... need help fast!! I bought that product before 6 months(approx.)

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