What I got from your post @NaeNasty is you have a new system with Windows 8 cause your old system crashed and you also have virtual machine installed after that it is not clear.
You need to install BT5 R3 on the Virtual machine or on your system? make it kind of a dual boot with Windows and BT.
And what was that about the .iso file. Are you saying you are able to get the .iso file for BT or you are not able to get the .iso file for BT. Also which virtual machine software is installed on your machine.