If one removes the message, it is probably removed for all drives.
I removed the drive letter and everthing is ok. For me that's the optimal solution.
I am using VeloSSD with an OCZ Synapse 128GB. Since the Synapse exposes only 64GB due to overprovisioning, I am using the Personal Edition of VeloSSD, which is sufficient in this case.
This configuration does quite well. Booting Win 7 is < 30 secs. I am additionally using ASUS InstantOn, providing my system in < 10 secs. Very nice...
Thanks for your good work. So far VeloSSD works good. I had problems using Nvelo Dataplex, as it corrupted my file system after some days of operation.