Download the SWEDISH LIP from here Download languages for Windows - Microsoft Windows
Even includes obscure languages like WELSH etc.
I used the Icelandic one -- works a treat on my systems. In some cases you need to install over a base ENGLISH version of Windows 7 but I think for Swedish installing over ANY installed language version of Windows 7 base should be OK -- the list contains the requirements.
Once you've installed go to control panel regional settings and you can get around 99% of the Interface switched to the alternate language(s). You can install as many as you like and note the Logon screen if you set the administrator options in control panel will also be presented in your chosen language.
You need to have Windows 7 PRO or higher unfortunately -- it won't work with HOME PREMIUM -- which IMO is daft since corporates often use ENGLISH but home users are much more likely to want Windows 7 in their native language.
You should find no trouble installing on Windows 7 Enterprise whether X-86 or the 64 bit version.
You can switch back to the original English any time after install too.