VS2010 and Qt5: Problems with installation?

[Thegreger]

So, I'm absolutely new to Qt, but I felt tempted to mess around and try a few tutorials, to get a feel for it.
I downloaded and installed Qt 5.0.2 (library and creator in a binary) for Windows 32-bit and VS 2010, and then the Visual Studio Add-in 1.2.1 for Qt5. Currently running Vista 32-bit with VS2010 (not express edition).

When I opened up VS2010 for the first time after installing, no Qt version was set. I added a version in "Qt Options", with name "QT5" and the path to the mscv2010 folder.

Choosing "new project" and "Qt Application" leads to a script error dialogue popping up, asking me if I want to continue running scripts on this page.
"Error: Unable to get value of the property 'ValidateIdentifier': object is null or undefined"
"URL: fil:///C:/QTAddin/Digia/Qt5VSAddin/wizards/Qt5GuiProject/html/1033/default.htm"
Clicking Yes on this dialogue leads to the Qt5 GUI Project Wizard popping up. According to tutorials, I should be able to click "Finish" instantly to accept default values. Yet when doing so, an error pops up with the text "The template specified cannot be found. Please check that the full path is correct." After this, VS2010 just returns to the "new project" browser.

Thinking that something might be wrong with my computer, and being unable to spend the entire day looking for the error, I tried installing Qt on another computer, with Windows 7 64 bit. This one, too, has VS2010. Upon loading Visual Studio after installing the Add-in, I'm greeted with the dialogue "The Add-in 'Qt Add-in 1.2.1' failed to load or caused an exception. Would you like to remove the Add-in?" and "Error Message: The system cannot find the file specified".

This really got me puzzled. Have I started in the wrong end, or done something obviously wrong? All tutorials I can find regarding developing for Qt in VS2010 simply starts by instructing the user to download and install libraries and the Add-in.

Qt seems seriously promising for my needs (if I could only get it to work), so I would be extremely grateful for any tips, or if anyone could point me in the right direction.