Vista 'royal.sys' Hatası.. BSOD!!

"A problem has been detected and windows has been shut down to prevent damage to your computer. 
   
  royal.sys 
   
  An attempt was made to write to read-only memory 
   
  If this is the first time you've been seen this stop error screen,restart your computer.ıf this screen appears again,follow this steps: 
   
  Check to make sure any new hardware or software is properly installed.ıf this is a new installation,ask your hardware or software manufacturer for any windows updates you might need 
   
  If problems continue,disable or remove any newly installed hardware or software.disable bios memory options such as caching or shadowing.If you need to use safe mode to remove or disable components,restart your computer, press f8 to select advanced startup options, and then select safe mode. 
   
  Technical information: 
   
  ***STOP: 0x000000BE (0x818451C8,0x01801121, 0x845121, 0x8699A42, 0x00000000B) 
   
  *** royal.sys - Address 8224E389 base at 8224A000, datestamp 45e7c315"