Problem with Lenovo n100 after updating bios

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Hi,
I have lenovo 3000 n100 0768HCQ laptop.I update my bios and after updating my system is not working well. When i press any key of keyboard ,all usb connected devices disconnects and after releasing key they get connected as they just have been plugged in.I tried with my old bios version to recover but it is not working . When flashing bios a blue screen appears and system restart.
What to do.. Please help me.......
 
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