BSOD driver irql not less or equla (nvlddmkm.sys)

Hi..
I am having problem of BSOD from last 2 months.
I have tried uninstalling and reinstalling of NVIDIA driver, but it still happens.
Whenever I start my PC this error always occurs within 10 minutes of start-up, then after restarting PC, It works fine.
please help!!
 
My PC configuration are here

System
Manufacturer- INTEL_
Model- DH61WW__
Total amount of system memory- 4.00 GB RAM
System type- 64-bit operating system
Number of processor core- 2
Storage
Total size of hard disk(s)- 757 GB
Disk partition (C:)- 83 GB Free (608 GB Total)
Media drive (D:)- CD/DVD
Disk partition (E:)- 82 GB Free (149 GB Total)
Graphics
Display adapter type NVIDIA GeForce GT 610
Total available graphics memory 3824 MB
Dedicated graphics memory 2048 MB
Dedicated system memory 0 MB
Shared system memory- 1776 MB
Display adapter driver version- 9.18.13.286
Primary monitor resolution- 1366x768
DirectX version- DirectX 11 or better
Network
Network Adapter- TAP-Windows Adapter V9
 
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