Hi Guys.I purchased today 747-400X and downloaded it too a memory stick.I have validated the product on my Windows XP machine and everything is working fine.I then put the memory stick in to my other PC(windows Vista 64 bit) but when I try to validate the product on my Windows Vista(64bit) PC I get a window pop up titled "unhandled exception" and a messageError number:0x800C0008Description: the download of the specified resource has failed.Any Ideas what this means? If I have downloaded the product via a XP pc does this mean it then wont work on Vista?Thanks for any help Tony

I recommend you read the EULA for the product. They will allow non-concurrent use on a second machine but you need to request the license to do so. After reading the EULA, you might email pmdg support for help.Hope this helps.