Importing Extensions freezes VB 5.0.6

[stephan.uzzell]

I installed VB 5.0.6 just fine one Windows 7, however have not had any luck getting the extensions pack (Oracle_VM_VirtualBox_Extension_Pack-5.0.6-103037) added. I've tried double-clicking the extensions pack - it brings up VB, but nothing happens. I've tried vboxmanage extpack install (and left it running overnight) - nothing happens. I've tried through file --> preferences --> extensions - nothing happens. VB itself seems to become unresponsive (though not to the point that windows thinks it is not responding). Not sure if there's a debug mode I can try, or if I should uninstall VB and try again. A reboot doesn't seem to have helped either.

Thoughts? Advice?

Thanks!

ETA:
Windows 7 Professional SP1
McAfee VirusScan Enterprise + AntiSpyware Enterprise 8.8

[stephan.uzzell]

Looks like my problem was an incomplete download of the extensions package. Slightly surprising that Chrome didn't warn me, or that VB didn't complain, but... I re-downloaded and re-attempted and everything looks happy.