Can not shutdown Windows 7 ultimate 64bit.

Windows 7 ultimate 64bit restarts; when I click on shutdown in start menu..I thought of using cmd line to shut down..I open cmd as administrative and typed "shutdown"& pressed enter..it gave these details that i have posted here..can someone help..i dont know how to read these..what it means if planned and unplanned..

Reasons on this computer:
(E = Expected U = Unexpected P = planned, C = customer defined)
Type Major Minor Title

U 0 0 Other (Unplanned)
E 0 0 Other (Unplanned)
E P 0 0 Other (Planned)
U 0 5 Other Failure: System Unresponsive
E 1 1 Hardware: Maintenance (Unplanned)
E P 1 1 Hardware: Maintenance (Planned)
E 1 2 Hardware: Installation (Unplanned)
E P 1 2 Hardware: Installation (Planned)
E 2 2 Operating System: Recovery (Planned)
E P 2 2 Operating System: Recovery (Planned)
P 2 3 Operating System: Upgrade (Planned)
E 2 4 Operating System: Reconfiguration (Unplanned)
E P 2 4 Operating System: Reconfiguration (Planned)
P 2 16 Operating System: Service pack (Planned)
2 17 Operating System: Hot fix (Unplanned)
P 2 17 Operating System: Hot fix (Planned)
2 18 Operating System: Security fix (Unplanned)
P 2 18 Operating System: Security fix (Planned)
E 4 1 Application: Maintenance (Unplanned)
E P 4 1 Application: Maintenance (Planned)
E P 4 2 Application: Installation (Planned)
E 4 5 Application: Unresponsive
E 4 6 Application: Unstable
U 5 15 System Failure: Stop error
U 5 19 Security issue
E 5 19 Security issue
E P 5 19 Security issue
E 5 20 Loss of network connectivity (Unplanned)
U 6 11 Power Failure: Cord Unplugged
U 6 12 Power Failure: Environment
P 7 0 Legacy API shutdown

And I found a unknown device? under other devices in device manager..
Heres details--
Device type-other devices
Manufacture-Unknown
Location-on Microsoft ACPI-Compliant Embedded Controller

Device status
The drivers for this device are not installed. (Code 28)

To find a driver for this device, click Update Driver.

Thought it to be a heat problem so I ran Speccy
Summary
Operating System
Windows 7 Ultimate 64-bit SP1
CPU
Intel Pentium T4500 @ 2.30GHz 38 °C
Penryn 45nm Technology
RAM
2.00GB Single-Channel DDR3 @ 399MHz (6-6-6-15)
Motherboard
LENOVO NITU1 (U2E1) 48 °C
Graphics
Generic PnP Monitor (1366x768@60Hz)
Intel Mobile Intel 4 Series Express Chipset Family (Lenovo)
Intel Mobile Intel 4 Series Express Chipset Family (Lenovo)
Storage
232GB Western Digital WDC WD2500BEVT-24A23T0 ATA Device (SATA ) 45 °C
Optical Drives
Slimtype DVD A DS8A4S ATA Device
Audio
Conexant SmartAudio HD
My lap is Lenovo G450.

Type shutdown /? to see the options.
I have a shortcut with this cmd line to shutdown immediately:
C:\Windows\System32\shutdown.exe /p

For the unknown device, right click - properties - Details tab - Hardware ID's
Put the mouse on fist string - right click - copy
Paste the string here. It's similar to PCI\VEN_168C&DEV_001A&SUBSYS_2052168C&REV_01

megahertz07 said:

for the unknown device, right click - properties - details tab - hardware id's
put the mouse on fist string - right click - copy
paste the string here. It's similar to pci\ven_168c&dev_001a&subsys_2052168c&rev_01

acpi\vpc2004
*vpc2004

You didn't specify the model of your Lenovo. Found this:
Lenovo Lenovo G40-70, G50-70 ACPI\VPC2004
Lenovo G40-70, G50-70

Download and install

Sorry..Its Lenovo g450

another link
http://download.lenovo.com/UserFiles...N1EGC15WW6.exe

Ill update soon

Still no luck.. Doesn't shutdown