U450 switches off suddenly

I've just bought an Ideapad U450 recently. Specs are provided below at the end of this post.
Ever since I bought it, it has sporadically shut-down and rebooted on its own. Each time I'll get a memory dump, and it has always been pointing to the wifi driver. I've updated it, uninstalled it, re-installed it, to no avail.
Recently, the crashes gets even worse, it just turns off suddenly without the blue screen of death. I've tried it while on AC and batteries and on batteries alone. It still happens each time. And each time when I start, there are no log files to indicate that it has crashed.
I noticed it crashes when I use programs that use sustained network connectivity, such as online MMORPG games and BitTorrent downloaders.
It doesn't get very hot, though I've always ensured that my laptop runs under my aircon outlet and sits on top of a laptop cooler.
I would be grateful for any help/advise.
   Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7600) (7600.win7_gdr.100618-1621)
           Language: English (Regional Setting: English)
System Manufacturer: LENOVO
       System Model: 20056                           
               BIOS: InsydeH2O Version 31CN21WW(V1.02)
          Processor: Intel(R) Core(TM) i5 CPU       M 450  @ 2.40GHz (4 CPUs), ~2.4GHz
             Memory: 6144MB RAM
Available OS Memory: 5942MB RAM
          Page File: 1823MB used, 10058MB available
         Card name: NVIDIA GeForce 305M
       Manufacturer: NVIDIA
          Chip type: GeForce 305M
           DAC type: Integrated RAMDAC
         Device Key: Enum\PCI\VEN_10DE&DEV_0A6E&SUBSYS_395A17AA&REV_A2
     Display Memory: 3189 MB
   Dedicated Memory: 474 MB
      Shared Memory: 2714 MB
       Current Mode: 1366 x 768 (32 bit) (60Hz)
       Monitor Name: Generic PnP Monitor
      Monitor Model: unknown
         Monitor Id: AUO303C
        Native Mode: 1366 x 768(p) (60.098Hz)
     Name: Intel(R) WiFi Link 1000 BGN
Device ID: PCI\VEN_8086&DEV_0084&SUBSYS_13158086&REV_00\4&1BB139FF&0&00E1
   Driver: n/a

can you perform clean windows installation by using one key recover?
or just install antivirus and check system for viruses.
also, if you can upload dump ( dmp ) file, it'd be better and easy to help you.

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