A computer-virus may have "sabotaged" your computer, to prevent the download.
If you have purchased an authentic copy of the software, then you will have received a serial-number.
On a second computer, download the _free_ anti-virus software from Microsoft: http://www.microsoft.com/security_essentials
and copy it to a USB memory-stick.
Carry the stick to your computer, and install this anti-virus software from the memory-stick.
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