I can't see where this option can be set back to default in IE7's Tools > Internet Options. The Settings button for Tab control in the General tab doesn't seem to have it, and neither does the Advanced tab nor the Security > Custom settings.
All I can suggest is resetting the whole of IE7 to default from Internet Options > Advanced tab, then the Reset button, but beware, all 3rd party add-ons, toolbars etc will be lost, as will all login/password details for web sites that are held by IE, along with cookies, history, and the Temporary Internet Files.
Perhaps others here will have better options.
i have a toshiba laptop. all of a sudden the IE7 program is not offering me the option to "remeber & open theses tabs when i open IE next time". i didnt click to have this question not asked. i really want this option but dont know how to go about changing it back to asking. can anybody help? i would be sooo appreciative...THANK YOU!!!!!