Re: loose ends
Depending on the issue with D-Pro it may be easier to write it off at this stage, what registering problem did you have?
As for Sonar, there's no reason why it should not continue to work as expected for as long as Windows allows it. Old hardware can go redundant simply because drivers aren't kept up to date. Programs like Sonar are more high level and resilient to change (even Microsoft don't want to put out an update that prevents everyone's software from working...)
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Current DAW. i7-950, Gigabyte EX58-UD5, 12Gb RAM, 1Tb SSD, 2x2Tb HDD, nVidia GTX 260, Antec 1000W psu, Win7 64bit, Studio 192, Digimax FS, KRK RP8G2, Sonar Platinum