If you can get into windows use this as the best option.
copy the file to c:\ then open MS Dos navigate to C:\ by typing cd \
then type the following:
ioperm.exe -i and then Cmospwd_win.exe /k
on next reboot cmos will be cleared.
you might also try working from the other way round! I have often had to crack passwords and one very good way is to try to get the confidence of the person who put the password on and then get them to produce a list of the passwords they often use and then try those. Often humans use regular passwords and going down this route may actually work faster!! It certainly has for me on quite a few occasions!