So I had Solid Edge ST5 on my Win 7 64bit, but I had to downgrade, because my school uses ST4. That may not help, but my problems is, that I uninstalled the newer version(ST5). Now, when I try installing the older version(ST4), it says that I have another version still on, but I don't. So, in short can't install new one, because it says i already have it. I already tried CCleaner, for uninstalling other one, but can't find it and also the registry cleaner in CCleaner. Any advice?