HELP! RANDOM BSOD Win7 64bit

i was just browsing and then BSOD appeared. i dont know why it happened. i used bluescreenview to look at the problem. the error name is IRQL_NOT_LESS_OR_EQUAL. how should i fix this? HELP

pc specs

i7 processor
radeon hd 6570 1 gb
4gb ram
500 gb hard disk

There is a sticky at the top of this forum explaining how to ask for help with BSODs.

Until you get back, you might run the memory test suggested.

Hello and welcome to the forums.
As Saltgrass explained.
First make sure your machine is configured properly to facilitate the collection of .dmp files.

Go to Start and type in sysdm.cpl and press Enter
Click on the Advanced tab
Click on the Startup and Recovery Settings button
Ensure that Automatically restart is unchecked
Under the Write Debugging Information header select Small memory dump (256 kB) in the dropdown box
Ensure that the Small Dump Directory is listed as %systemroot%\Minidump << where your .dmp files can be found later
Click OK twice to exit the dialogs, then reboot for the changes to take effect.

Then:
Please read the first post in this sticky thread here How to ask for help with a BSOD problem
Do your best to accumulate the data required.
Run the SF Diagnostic tool (download and right click the executable and choose run as administrator)
Download and run CPUz. Use the Windows snipping tool to gather images from all tabs including all slots populated with memory under the SPD tab.
Likewise RAMMon. Export the html report, put everything into a desktop folder that you've created for this purpose, zip it up and attach it to your next post (right click it and choose send to, compressed (zipped) folder.
Additionally, if you haven’t already, please take some time and fill out your system specs in your forum profile area Help Us To Help You By Filling In Your System Specs. .
Good luck
Randy