Trial Expired - How do I uninstall windows if I cant use Paralells?

My trial period is over for Paralells Desktop 7 for Mac (installed on a macbook air). I had installed this and then setup a virtual windows 7 environment and had Office 2010 running in that. I now want to remove the Windows 7 and Office 2010 installs and then completely uninstall Paralells Desktop 7 also.

How do I do this? I cant get to the windows environment to install Office 2010 and I cant get to Parallels to uninstall Windows 7 environment? Or am I being very stupid - is is just a case of uninstalling Paralells and this will also remove Windows 7/ Office 2010.

Would really appreciate some advice! Thanks in advance