the problem isn't the drive you installed Cubase on, but a file that got corrupted when updating from 7.0.2 to 7.0.3 or from 7.0.3 to 7.0.4. It is a known issue that is best solved by re-installing Cubase 7.0.0 and then skiping those 3 updates and going straight to 7.0.6. You don't have to re-install everything, no content, no plugins... just the Cubase Core application.
Hope this helps
Luis Dongo, Technical Support
Steinberg Media Technologies GmbH
Hamburg, GermanyCheck out Steinberg on YouTube, Twitter and Facebook!