I see a lot of errors stating "The Device, \Device\Harddisk0\D, has a bad block". There are 75 of these errors posted 34 times during one minute the evening of the 1st and 34 times during one minute on the evening of the 2nd. These show up in "System".

In "Application", I see the prep.com error fourteen times. Six times early afternoon on the 1st, three times late afternoon on the first and five times just after midnight last night.

When I Google "Combofix prep.com error" I find this...

http://answers.yahoo.com/question/in...3050945AAMoTP6

Although the answers are not what we are looking for, it does show that someone else has experienced the same error message.