just downloaded dataloader. Can not sign on using my salesforce user id and password. Get error that i have entered wrong ID or password

I have tried both paths.

This one seems take the longets to get a message.

Here is the URL in my development environment.

&retURL=%2Fsetup%2FforcecomHomepage.apexp%3Fsetupid%3DForceCom%26retURL%3D%252Fsetup%252FforcecomHomepage.apexp%253Fsetupid%253DForceCom%2526retURL%253D%25252Fui%25252Fsetup%25252FSetup%25253Fsetupid%25253DPersonalSetup

Bill