I have only one voicebank, and VOCALOID2 gives me the error "cannot open the synthesis engine"

[gumilytime]

i am using Windows 10 x64, i try changing the folder of VOCALOID to Program Files 86x to Program files, i am desesperate

 

[gumilytime]

desesperate bump

 

[Leon]

Hmmm. Have you activated V2 already? I think if you type "activate2" in the Windows search bar, it should pop up. Although I don't think deactivated voicebanks should cause it to be unable to open. You might try uninstalling and reinstalling. Make sure you let it do a "complete" install, instead of custom. (At least for the first time. If you ever buy any more Vocaloid2 voicebanks, you can do a custom install and only install the voice database)

 

[DefiantKitsune]

I would recommend trying these steps if that doesn't work:
SUPPORT - VOCALOID2: 起動時に「合成エンジンを開けません!（CANNOT OPEN SYNTHESIS ENGINE!）」と表示され起動できません。 | SONICWIRE

Also, you may need to set your system to JP locale depending which voicebank you have.