VMS 8.4 Alpha Hobbyist disk images

[Douglas Taylor]

I'm getting an Alphaserver 1000a and wanted to install VMS 8.4 - 
hobbyist license from CD.

So, I went to the folder on my PC where I have the 8.4 hobbyist 
distribution.  There are 3 ISO files; ALPHA084, ALPHA084LP1 and ALPHA084LP2.

I thought I would burn these to CD and up and away.  However, Windows 7 
balks and says, 'The selected disc image file isn't valid'.

Is it Windows 7 or is there something I'm missing?  Is the CD on the 
Alphaserver 2048 byte block size or 512?

Doug