Lets make sure Autocomplete is configured correctly :
In Internet Explorer click the Tools menu/ Internet Options/ Content tab.
Under Personal information, click AutoComplete. In the AutoComplete Settings dialog box, select the User names and Passwords on forms
and the Prompt me to save Passwords
(if they are not already selected), and then click Okay. Click Okay again to close the Internet Options dialog box.
Go to Start, and then Run
. In the Open box, type Services.msc
, and then click Okay. In the Name list that appears, locate Protected Storage
. Note the Status Column
. If Protected Storage is running, Started will appear under Status. If Protected Storage is not started, start it. To do this, right-click Protected Storage, and then click Start.
If the service is already started and running, Stop and Restart the service.
Were you ever asked if you wanted IE to remember your password and responded by saying No?
If so, this is one possible fix: Web Login AutoComplete Passwords