Following error is generated while trying to access site with classic ASP page:
500 - Internal Server Error
Root cause is in installed McAfee software on this server. During ASP application execution on site, additional library from McAfee folder was loaded, but due to insufficient privileges on this file, internal server error occurs.
Add permissions for "psaadm" and "psacln" users on file:
C:\Program Files (x86)\McAfee\VirusScan Enterprise\VSCore\ScriptSn.20140124130134.dll