Root Problem installing HBOOT drivers


I finally decided to root my HTC Desire because of the low internal memory.
But I have not managed to get any longer then to the HBOOT drivers installing. I cant seem to install the drivers rigth because of a missing hashcode error. I followed unevoked guide for Windows HBOOT driver installation. Apparently I cant link to it because of first posting.

At the second last screensshot I get instead a message: "the drivers was found,
but colud not be installed. The hashcode for this file is not included in the assigned directoryfile" (not the exact message, translated from norwegian).

After hours of searching I havent found anybody with a problem like this. Hope someone can help me, despite my poorly explanation and bad english.

I have Windows 8.