Thanks for your help, sorry i lost track of this thread as the problem never arised back.
I didn't set the Time in the BIOS, i first set the time by logging onto my WIN7, then shut down my pc and pulled out the power plug. Replaced the battery and did what i said i did above, like taking out the JUMPER but didn't wait 5 seconds and also couldn't find that RESET switch. Thats far as i remember and it did the trick well for me. I haven't encountered the error again.
The battery was indeed new, it was seal packed.
PS: i accepted your response as the best answer