Laptop will not operate or charge the battery from

1. Power OFF laptop
2. Remove battery
3. Use power pack and turn ON laptop (without battery)
4. The laptop will work.
5. After Windows has settled down, insert battery (with laptop on and Windows running).
6. Allow the power pack to catch up a couple of hours.
7. It will work now...

Your power pack has a voltage regulator built into it to maintain and controlled and steady correct voltage. These devices are usually under a great deal of stress and fail often. The thing to remember about power supplies for laptops is you get what you pay for. The PSUs that are coming from overseas will power your laptop but they get very hot, fail frequently and in most cases will not give you a reliable stable power supply. Your power supply is shot and you will need another to properly run your machine.