RTX2011: Driver initialization failed due to corrupted registry access

Registry accesses made by the driver are corrupted in RTX2012, RTX2011SP1 and later. RTX2011 is not affected!
An issue solved with release of RTX2011SP1 introduced a registry API change (RegQueryValueEx returns wide strings instead of ansi string). Release Notice RTX2011 Service Pack 1:

• Resolved an issue where RegQueryValueEx returned wide strings when Unicode was disabled in project settings (RTX-9)

This change results in a wrong read of the installation path!