How to change date & time settings of yahoomail?

WIndows 7 time and date settings problem.?

• Everytime I reboot my pc or I start it, the time and date settings goes back to 2002 and time goes back to the start, Someone told me that I need to change my mobo battery, I've done that. but still this issue still happen, Also my another problem in my pc is everytime I turn it on, the monitor takes about 50-60 seconds to show up the screen ( I remember I had change the video card and power supply before this things happened) pls help my pc is intel e2180 dual core 2.00ghz

• Answer:

  You said it happened after changing your video card and PSU. Try disconnecting and reconnecting all power cables to the motherboard. Reseat your video card too. Sometimes there's also a power cable that is supposed to connect directly to the video card. You may have missed something.