No, wnaspint.dll is Goldenhawk's ASPI driver. So, if you have "Use Acoustica's ASPI driver" selected, you'd be using wnaspint.dll and you'd get that error. Turning off that option allows Mixcraft to use whatever wnaspi32.dll file you've got installed on your computer. If Frog ASPI doesn't work for you, please submit an Acoustica Support Request
and send us your Mixcraft-log.txt file. Since you have Windows Vista, be sure to click the "compatibility files" option when you go to collect the log file.
C:\Program Files\Acoustica Mixcraft 4\mixcraft-log.txt