Hank

Business with SP1
Sony laptop, fast core2duo, 4GB
Defender+Avast!
Working beautifully for many months, and then a few
weeks ago this began happening:

Perhaps 2-3 times a week, and with no consistency of
circumstances, a blue screen will appear. It might
happen while working or when returning from hibernate.
There's a countdown as memory is stored, and then a
freeze. The only way to recover is to do a hard OFF (5
seconds on the power switch) and restart.

When it first happened, I had not installed or changed
anything, so I was comfortable doing a restore. It
happened again.

It's confusing because the stated cause is inconsistent.
I've checked to ensure that all drivers are updated and
nothing that's contraVistarian is installed.

What analytical steps can I undertake to discover what's
causing this, and then to help me make the necessary
changes?

Thanks!

Hank