When installing VAX.1201 I've received the following error:
LoadLibrary(c:\\program files\\visual assist x\\vapkg.dll) failed.
GetLastError returns 0x0000007e.
The reason was probably that I don't have VS.Net installed and MSVCR71.dll is not anywhere in path.
Anyway VAX installed successfully and seems to work without any problems. Tooltips in the options dialog are really cool and smoothly replace documentation .