BSOD caused by ntoskrnl.exe

My laptop goes to the BSOD every 5-20 minutes.  Boot time is also much slower than usual.  Here is the minidump info:

Bug Check Code: 0x00000109

Parameter 1: a3a00f58`c9162777

Parameter 2: b3b71bdf`1b955d32

Parameter 3: ffffe000'0118ba20

Parameter 4: 00000000`0000001c

Caused by driver: ntoskrnl.exe

Caused by address: ntoskrnl.exe+14dca0

Any help on how to fix this would be greatly appreciated!

Thanks!

Chris