BSOD during Avast scan in boot mode Windows XP SP3

Avast Free Antivirus / Premium Security
1

I have used avast home edition for almost five years. Great program, no problems until possibly now. I have Windows XP SP3. And I usually do a boot scan with avast once a week. However, since December 3, 2008, everytime I thorough scan with avast inside boot mode, it progresses but before it ends around 50% the computer crashes and I get a Blue Screen of Death. The BSOD has the following:

kernel_stack_inpage_error

*** Stop: 0x00000077
0xC000009C
0xC000009c
0x00000000
0x010FE000

Yet, I have had no virus alerts or infections for over a year. However, I am able to do a thorough scan in Regular Mode. There is no notice of infection. I do not think it is infected, but I have no idea why this is happening. I am computer illiterate. This is my only computer, and I cannot afford another one at this time. Help is greatly appreciated.

2

Never post twice the same… just double the effort of help :cry:
Follow http://forum.avast.com/index.php?topic=40668.new#new

3

Of avast? This is not necessary (the user does not ought to do it). The Home version works perfectly.