an unknown blue screen

They mean memory remapping. Before doing that, have you updated all your drivers, from network drivers to video? Also try a full system scan with Malwarebytes. Then you can try digging into the BIOS. You can also flash the BIOS if your motherboard is listed in msinfo32 or dxdiag, search for those from the start menu.
 

My Computer

System One

  • Manufacturer/Model
    Sony Vaio Z46GDU
    CPU
    [email protected] w/6MB L2 cache 1066MHz FSB
    Memory
    6GB DDR3 1066MHz SDRAM
    Graphics Card(s)
    9300M GS 256MB + Intel Integrated 4500MHD
    Monitor(s) Displays
    13.1" WXGA True Colour Tough
    Screen Resolution
    1600x900
    Hard Drives
    320GB SATA 7200RPM
    Internet Speed
    1MB/s
Look for an update to that BIOS. As for uninstalling SP2, locate view installed updates and select the right option.
 

My Computer

System One

  • Manufacturer/Model
    Sony Vaio Z46GDU
    CPU
    [email protected] w/6MB L2 cache 1066MHz FSB
    Memory
    6GB DDR3 1066MHz SDRAM
    Graphics Card(s)
    9300M GS 256MB + Intel Integrated 4500MHD
    Monitor(s) Displays
    13.1" WXGA True Colour Tough
    Screen Resolution
    1600x900
    Hard Drives
    320GB SATA 7200RPM
    Internet Speed
    1MB/s
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