Try this website, you will get a list of the posible credit companies.
http://www.comparis.ch/banken/privatkredit/default.aspx
Also, try to go to small banks like Raiffeisen, I'm not sure if they do consumer credits but they may be less restrictive.
Finally, if your credit is related to a purchase (car, computer, etc.), you may get a financing solution with the seller. Some time ago, even Interdiscount could arrange that for a TV.