You can try this. Save the "DMSETUP" file to your desktop.
Double-click it and when asked select the Customize option and download only 1 application at a time. starting with Firewall, then VirusScan and so on.
See if that helps.
If you have already attempted this and it failed try it again as above, but after running the "MCPR" removal tool linked in my signature, reboot and retry.
The only alternative would be to try using Customer Service Chat linked in my signature and asking them for alternative suggestions. Probably the UK one is your nearest, but you can use the US one too. You will see the country choices when you try it.
What is your operating system and service pack and what browser version?