How to waist your time

by trying to install ms sql 2008 in win xp sp3:

If you ever have to do this and if it gives the following error:

" is not a valid login or you do not have permission.

and if your user is in the administration group and it still gives the error, please remember to create a new user in the same group and voilá, it works.

But still you can waist a saturday untill you decide to create that user.