Downloading Endnote X2 on a Windows Vista machine

Hi, Just wondering if anyone else has seen an error when trying to download Endnote X2. The program trys to intall but is stopped and an error saying something like 'unable to install…it looks ‘wrong’?? I am wondering if it could be something to do with 64 bit or other software installed on the PC?

Any suggestions would be great. Regards, Bernie