Blue Screen

Yesterday, I installed antivirus software on my laptop. After doing so and
restarting my computer, I began to look at the features of this software. I
had had the computer on for about 5 or 10 minutes when a blue screen appeared
for about 2 seconds, and then my computer restarted. When it restarted, it
didn't even get to the loading screen for XP before the same blue screen
appeared, again for only two seconds, and my computer again restarted. I've
already tried booting my computer in safe mode but the same blue screen
appears.

My only guess for the cause of the problem is that before installing the new
antivirus software, I had to uninstall my previous antivirus software and
firewall, then during installation, I was required to be connected to the
internet. Though my knowledge of computers is limited, my assumption is that
a picked up a virus during that period of installation, and it is hindering
my startup.

My laptop is a Toshiba Satellite A105 - S2061 running XP. It has an Intel
Celeron M processor and an ATI graphics card. The only changes made recently
to my computer, were uninstalling "Avast antivirus home edition" and
"Zonealarm Firewall" and installing "CA internet Security Suite Plus 2008,"
which includes anti-virus, anti-spyware, firewall, anti-spam, and others.

The message read,
"A problem has been detected and windows has been shut down to prevent
damage to your computer. etc."
And gave the error code,
"STOP: 0x0000007E (0xC0000005, 0x805C607B, 0xFAFE51E8, 0xFAFE4EE4)"

I have not regularly backed up my computer as I now see I should have. If I
could retrieve the data from my computer that would be great. Thank you for
your help.