Pc will not go to "sleep" Blue Screen. I renewed my Spyware and Anitvirus on my laptop

Question

I renewed my Spyware and Anitvirus on my laptop last Tuesday, since then y laptop will not go to standby mode whenthe screen is closed. The fan will run and when the lap top is opened there is a blue screen indicating that there has been an error with a file named atidvag and that windows has been shut down.
Once the PC is started again there is an error message that Windows has recovered from a serious error.
The detail of the error report for Microsoft are
BCCode 100000ea
BCP1: 828BBDAB
BCP2: 82AA5C40
BCP3: F7A3FCB4
BCP4: 00000001
OSVer; 5_1_2600
SP: 2_0
Product 768_1

I have Vista Home Premium and system Shuts Down incorrectly whenever I try Sleep or Hibernate. The computer has never gone to sleep correctly since I bought the computer new three months ago