From the march issue of SOS, in a review of cubase 5 they talk about whether you should use 64bit, and Virus get's a mention:
"The most important consideration is that there need to be 64-bit drivers for all of the hardware you require on your system. Most computer components should be covered, including most audio hardware, but some musician-specific hardware lacks 64-bit support at present, including DSP cards and instruments like Access’s Virus TI"
come on access, u have to do it now