problem installing revit architectu​re 2011 and autocad electrical 2012

[ryanonline25]

hi i have just downloaded Revit Architecture 2011 and AutoCAD Electrical 2012. When i go to install them a window pops up called 'winRAR self extracting archive'. they both will go throught the process up until near the end then it stops. the fault that comes up says that some isntallation file are corrupt. attached are screen shots of my problems...i have uninstalled all autodesk programmes and any file in the autodesk folder also...any help is greatly appreciated

running on Windows 7...64 bit

Enda

[DarrenP]

you haven't installed anything yet

all your doing at this point is extracting the installation file

it sounds the download is corrupt

try downloading again using a another browser

[TravisNave]

Darren is right.  Your download is corrupt and will not install. 

Problems downloading the Autodesk software and/or CRC errors may be avoided by using another web browser, or using the alternate browser download method.

For more detailed information on this process, please see the following blog post tip here:

http://upandready.typepad.com/up_and_ready/2011/08/downloading-software-browser-download-vs-download...