From the manual describing the automatic installation of the Tools via MSI to suppress driver signing messages. If you look at the registry before and after you may find the key which disables the messages:
For all Windows systems except Windows Vista:
a) On the virtual machine’s desktop or Start menu, right-click My Computer and choose Properties.
b) Click the Hardware tab and click Driver Signing.
c) In the Driver Signing Options dialog box, click Ignore and click OK.
d) Click OK in the System Properties dialog box.
For Windows Vista:
a) On the Start menu, right-click Computer and choose Properties.
b) Click Advanced system settings > Hardware > Windows Update Driver Settings.
c) Click Never check for drivers when I connect a new device and click OK.
d) Click OK in the System Properties dialog box.
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VCP / vEXPERT 2009