Help…

I can't download a very important attachment that I just received, for it says "prohibited attachment" due to a msg saying “The Microsoft Office product is not installed on your computer”.  Although, I thought I had been using MO 2010 version, I followed the steps to download a free version in order to view the document only to get a msg that I'm on a slow connection and it may take a while.  My question is why am I having this problem in Microsoft Office that was included with the purchase of my PC three years ago, and why am I getting this slow connection error?  Lately, I have been having more and more problems with my PC, to the point that I even tried a Recovery attempt before the problems seemed to have started, which did not help.  Any help would be greatly appreciated!  Unfortunately, I don’t know much about computers and rely solely on the help from MO troubleshooting and MO community. Thx, Blittle