SQL Server Express R2 password not complex enough

Hello,

I'm trying to install "Visual Web Developer 2010 Express". Automatically "SQL Server Express 2008 R2" gets selected.

After I pressed install and agreed to the licences I get to the page of the SQL authentification. On this page I'm asked to enter a password.

Now, I've entered at least a hundred different password with all sort of combinations made of numbers, small and big characters up to a lenght 20 signs. I NEVER used any alpha numeric signs. And still it tells me the password/keyword isn't complex enough.

Here a password combination I've tried: 8Q1wi27er3yT54u6O1K Isn't that complex enough?

Can some one tell me what I shall do?

Thanks for any help!