Also I found cg64.sys was not digitally signed for all versions I have of clockgen for nf4, v1.01, v1.02 and 1.03 in their original archives and because of this none of them work work on Win 7. Anyway some how I have a signed cg64.sys. Can't remember where or how I got it but it works. Attached is an archive of v1.01 which includes the signed cg64.sys driver file. You can use cg64.sys with the other versions of ClockGen for nF4 as well.