Well, it could be done in normal boot.
But you should be able to boot in Safe Mode. That should be another problem that, maybe, another savvy user could take a look in your computer. It's dangerous to use a computer that, for any reason, can't boot in Safe Mode.
Agreed. Even though you told me you had no other security software on this machine (#2), I just want to verify that you had no other antivirus or other security software previously installed on it.
Please read this information from your other machine (#1):
Check the information on the first post of this thread under Virus/Worms for you to check your machine for malware:
http://forum.avast.com/index.php?topic=53253.0.
Follow the directions of obtaining an
MBAM log (make sure you
update MBAM first) and
OTL logs and you can
post the MBAM log here (copy and past) and
the OTL log as an attachment (Additional Options in the bottom left corner under the message screen when posting). We can then analyze this in the meantime for any malware, and if any malware is found we will refer you to one of our malware experts. You can post the MBAM log first, then get back to us with the OTL log.
Please let us know if you have any questions.