BSOD when mutlitasking ( playing game and surfing the web)

Code:

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Use !analyze -v to get detailed debugging information.

BugCheck 1000007E, {ffffffffc0000005, fffff8800f220e7a, fffff880027c7568, fffff880027c6dc0}

Probably caused by : dxgmms1.sys ( dxgmms1!VIDMM_GLOBAL::ReferenceAllocationForPreparation+76 )

Followup: MachineOwner
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Code:

Host Name:                 CHAN-PC
OS Name:                   Microsoft Windows 7 Ultimate 
OS Version:                6.1.7601 Service Pack 1 Build 7601
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Standalone Workstation
OS Build Type:             Multiprocessor Free
Registered Owner:          CHAN
Registered Organization:   
Product ID:                00426-OEM-8992662-00173

At the moment my only suggestion is to check for updates to your video card driver but I'm not sure whether this will solve the issue since the counterfeit Windows 7 installation you have may well mask the true cause of the BSOD's. Its very common for counterfeit installations to contain modified code (incl. malware) that causes the installation to behave in an unexpected manner. For this reason, many analysts will not attempt to diagnose BSOD's on these sorts of installations.

My best recommendation to you is to purchase and install a genuine Windows 7 installation to minimise these sorts of problems.