Welcome to Seven Forums Nicklaspoke. Unfortunately, it looks like Swedish is not a supported language in speech recognition. Even though you want to speak to it in english, the language of the operating system matches the language of Windows Speech Recognition.
Windows Speech Recognition supports the following languages:
This KB article is for Vista, but the same holds true of Seven. The Windows Speech Recognition language must be the same as the operating system language in Windows Vista
If you had the english version of 7, or had Ultimate or above, and could install the English language pack, then I believe it would work. A Guy