Cannot install itunes 7.1 in Windows Vista Home Premium

I am getting this error when I try to install iTunes:

"iTunes could not be installed because Visual Basic Script (VBScript) is not installed or has been disabled. Make sure VBScript is installed, turn off script blocking in anti-virus and personal firewall software, reregister VBScript, and the install iTunes."

Does anyone know how to fix this problem? Please advise.

Thanks

Other OS Windows Vista Home

Other OS Windows Vista Home