BSOD halmacpi.dll, ntkrnlpa.exe ERROR KERNEL_MODE_EXCEPTION_NOT_HANDLED,IRQL_NOT_LESS_OR_EQUAL

Hii am facing a regular BSOD problem from past few days.actually everytime when i play high graphics games or do multi tasking and use much of RAM size.Then everytime my gets restart, sometimes long time use of pc also makes my pc restart.so i entered msconfig, and there i disabled some start up programs which i don't use.but from last few days i am getting BSOD with halmacpi.dll, ntkrnlpa.exe error when i play high graphics games or sometimes using video converters. what is it? my pc's warranty service is still active. here is my system config.OS Name Microsoft Windows 7 Home BasicVersion 6.1.7601 Service Pack 1 Build 7601Other OS Description Not AvailableOS Manufacturer Microsoft CorporationSystem Manufacturer LENOVOSystem Model IdeaCentre B305 10052System Type X86-based PCProcessor AMD Athlon(tm) II X2 235e Processor, 2700 Mhz, 2 Core(s), 2 Logical Processor(s)BIOS Version/Date LENOVO D5KT18AUS, 01-04-2011SMBIOS Version 2.6Windows Directory C:\WindowsSystem Directory C:\Windows\system32Boot Device \Device\HarddiskVolume1Hardware Abstraction Layer Version = "6.1.7601.17514"Installed Physical Memory (RAM) 2.00 GBTotal Physical Memory 2.00 GBAvailable Physical Memory 1.01 GBTotal Virtual Memory 4.00 GBAvailable Virtual Memory 2.63 GBPage File Space 2.00 GBwhat is the fault in my lenovo?plz see the attached files & plz help me...

Hello and welcome to the forums.
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