My computer keeps on displaying an error message when I’m trying to execute a plug-in file called play_vst.dll in programs such as Sibelius 5 or sequencers. I don’t understand why this error keeps popping up neither do I know what’s causing this. Due to this, I am now unable to run this plug-in in the programs that I’m frequently using. My computer’s currently running Windows Vista Home Premium. I’m thankful to those who can help.