Sounds like you have identified the REAL problem, you have a rather slow and CERTAINLY intermittent connection to the internet.
That is proven by the facts that :
- it takes forever to download Open Office (shows slow connection)
* Open Office is 150Mb, it takes less than 5 mins for me to download
- and towards the end of this very long download time, you get a "can't communicate with the server" error (shows your connection is intermittent at best)
* is you lose a connection while downloading a large file the download will fail
NOTE: having an intermittent connection will also cause failure with your attempts to register Microsoft Office
FIX:
If you using a wireless connection to the internet, try connecting Directly to your internet modem
Also, Check with your internet service provider to see if they can fix your connection. If it's DSL, I've had mine looked at & repaired several times. Sometimes trouble with the phone lines but once it was their Bad modem which they replaced for free....
Give 'em a call....