my windows crash with error message and blue screen

hi i have asus m5n with 1.6 ghz centrino processor and intel 855gme chipset.
recently i updated my driver for bios atkacpi, vga drivers. after which im having this trouble.
my window crashes with blue screen leaving error message
STOP: 0*0000000A(0*840f4ffb,0*00000002,0*00000001,0*804f af34)
IRQL_NOT_LESSOREQUAL
GIVE SOMETHING LIKE BEGINIOING OF PHYSICAL DUMP

I HAD THIS ONE TOO ONCE WDM DRIVER ERROR 22F
ATKACPI.SYS+A36 AT F8991A36

THIS ONE FROM ERROR REPORT
BCODE10000050 BCP1: B5A12D38 BCP2: 00000001 BCP3: 805ACE5A BCP4:00000000 OSVer5_1_2600 SP:1_0 PRODUCT:768_1

i have done complete formatting of windows many time , nothing seem to work

please help
thanks in advance