The last time I helped someone with that they were not spending a dime but trying to get by with demo's and old hardware that had no drivers.
I didn't see where you obtained something like http://www.turtlebeach.com/products/usb-midi-cable/home.aspx
Microsoft (msoft?) does not make midi cables or gear so let's not deal with them. Same for Acer.
For two months I have been trying to connect my (simple) "Midiplus 61" piano keyboard to my Acer "Travelmate 4150" laptop (under Win XP Home) using one of its USB ports, so as to drive a music program. The keyboard produces a MIDI stream. I must have downloaded 250 Mbytes of so called "USB-MIDI Drivers", some from Acer, some from MSoft, many from individuals who profess to know the solution. Now, in desperation I seek help from my CNET colleagues - "HELP!!".
I must add that the keyboard works fine when driving through Win 98 on an old machine and the laptop produces excellent Steinway piano sound when running, say, a "Pianoteq" demonstration file.