Component Services

I have a dll that is registered in component services that goes out to the web and gets a credit report and uses a client certificate to authenticate to the server. It works fine on my machine, but I am always logged in and I installed the client cert under my account. The client leaves their servers at a login prompt. In the properties of the component, under Identity, I want to run it as "This user" instead of system account, but I cannot get it to work under the account that the cert was installed under. Any ideas?

Thank you!