Most everything for Mac is different from Windows: it works consistantly!

Did you, by chance, get an Intel Mac? If so then you have the capability to run Windows and keep your PSE5.

I have PSE4 for Mac, but no experience with PSE5 for Windows. However, I can tell you that PSCS2 is pretty much the same for both platforms. I wouldn't imagine that Elements would be THAT different.

- Joe U.