Or, get a Mac.
Eight YEARS on broadband, NO virus software, ZERO problems...
Think they are a bit expensive? What does eight years of virus protection cost you...? (And pop-up blockers, and spyware scanners, etc..)
They run Windows now (and anything from DOS to Vista, Linux to Solaris) so you can still run your Yamaha apps. Just NEVER talk to the Internet while you are in Windows, and all your virus problems will be a thing of the past.
This isn't a taunt... it's a testimonial. If you are sick of the things that Windows puts you through, if you are tired of worrying whether a simple visit to a web site will hose your drives, take another look at Apple.
The horsepower gap has gone, the price gap is MUCH smaller, and the included apps MORE than make up the price difference. Add in Logic Studio at half price, and it's almost a no-brainer for a musician (who doesn't WANT to be an IT geek)...
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An arranger is just a tool. What matters is what you build with it..!