I'm using VC in Cubase 4 and it's very stable (both apps).
I guess you could try using a different USB cable, The virus cable is still in the box. I used a 3' Belkin from day one after reading a few post about problems (random) with the Access cable.
Also update your TiOS to 2.0.1 and your Cubase4 to 4.0.2.
There's also lots of help in the "sticky" post of this forum.
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