Pro Tools 10 install issue (HD Driver x64 missing) ?

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Greetings

New here, and a new Pro Tools user.

I have downloaded Pro Tools 10 and I am having a strange install issue.

Have a top spec Windows 7 PC (64 bit windows Pro).

I will be using 11R and a MBox Pro.

I do not have the Pro Tools HD version.

However, early in the install process I get an error message along the lines of

"Cannot continue install - Avid HD Driver x64 could not be found - installation will stop".

What is confusing me as that I did not select an HD option at begining of installation and I am not aware that I need this driver. I am aware I need drivers for the 11R and MBox Pro - but this appears to be different.

Any ideas?

I note from the Avid download site that you can indeed download a HD Driver for windows - but I believe that is only if you are using HD hardware.

Thanks for your help;

MArk