Did you try going into your user settings and going to the Language tab? If not, right click on your user name, select "Settings..." and then go to the "Language" tab. There you can select whatever language you want. You'll have to reboot your computer after you change it.
Hope that helps!
SolidWorks and Windows already has the English language. But PDMWorks is in Portuguese, and found no option to change the language!
Like Katie says go to the admin module then change settings for user or users group (right click on user or users group and settings) to english.
I'm not sure that you must restart your computer but this is the best way to be sure that new settings will be sets
You need to change the language in the Windows Control Panel | Regional and language option to english.