Overall, Hava v1.8.0.11 works great under Windows 7 x32 build 7000 and builds after 7000.
Unfortunately, when you first boot up and if you wait a few minutes before logging into the computer, havanet.sys will blue screen the system with a IRQL_NOT_LESS_OR_EQUAL.
I've performed a kernel debug crash dump on it, although unfortunately the symbols are not available for the build of Windows 7 I am running.
If I log into the computer in a hurry, the blue screen is avoided and the Hava works perfectly.
Also of note, it seems the Ulead SDK is a known 'problem app' with Windows 7 because it comes up as a 'potential blocker' when installing HAVA.
I never use the CD/DVD burning features of the Hava and uninstalling Ulead after the fact seems to work just fine. The bluescreens happen no matter if Ulead SDK is installed or not.
If you want to see the cut-and-paste of the crash dump and analysis, read my original post on the Hava forums
here.
Next up, x64!