If you have previously installed SSL DLLs from somewhere else, you should make sure that you have removed them before trying to use the SSL DLLs from the mIRC website. If that still does not solve the problem, I can't think of a reason I'm afraid. I performed my test on a completely clean Windows 7 installation, with no additional DLLs or updates, so the SSL DLLs on the mIRC website should have no problem working on your system.