I have the 56kdspes-x2 3.430003a USA version for windows 95. I formated 95 and installed windows 98. Than found the v90 upgrade at multiwave, but couldn't get it to work. I finally figured it out. From the floppy v90 I copied the disc to cdrive where the 56kes-x2file was and reinstalled the modem. It copied all the old and new driver info and installed and I'm smoking at 57,600bps. Set all your modem speeds to 57,600. Also in dial-up properties under modem connection, check the scroll above the configure button, make sure only one modem is listed, if there'e two, high light the last one down and you should be up and smoking.