Thanks to the info in this thread I'm in the process of replacing my dedicated Shuttle PC (AMD Athlon 2500+) with a Vmware XP virtual machine under Windows 7 64bit. (Quad 6700+ ATI HD4850).
I'm using a Tacx flow with the green I-magic head unit and fortius software.
I'm running Windows 7 Home Premium edition (so don't have access to XP mode as it's not included) so had to install Vmware Player 3 and create new XP machine.
Decided to create the smallest XP image I could with only a 4 GB filesystem, and 1GB ram (change the pagefile size after install) which meant using CCleaner to remove rollback points, during updates etc but at backing up the VM is now super easy.
Installed the Fortius software to the c:\program files directory from v1.21 software disk and upgraded (about 8 times) to get 2.04. (Final size of the Tacx Fortius Directory was 1.06GB). During install the I-magic driver installed without an issue.
Now 4 GB isn't enough to install the RLVs. But I had a plan
By using an external USB drive it can be mounting in the VM when it's running or available to the Windows7 when not. I would have used a Host network share disk but Fortius won't run from the share, so copied the Fortius software to the USD disk and it seems to run without problems.
The final plan is use the external USB driver under windows 7 and TTS 3 (if I decide to purchase) and to solve the duplication of RLV (I.e. not duplicating them) by using Junctions File/Hard links
in windows 7.
By using the a small VM I can archive it with ease and reinstall the RLVs from disc (just copy the files rather than run the installer) to the external drive if it all dies at some point.
Fortius under VM seems to require the I-magic head unit to be unplugged/re-plugged once the VM had boot to software run, but I have similar problems on shuttle.
I've not yet played around too much with full screen or running it with dual monitor/TV - hopefully I should get chance later this week.