"Malicious URL Blocked" message over and over again.

[jeffc_lenovo]

One other thing that's very odd...the device manager no longer has an entry for Disk Drives (as if the machine has no hard disk). It seems to me that this points to some sort of nasty living in the mbr. Gmer shows a 'suspicious' alteration to atapi.sys and shows an unknown device (as in http://forum.avast.com/index.php?topic=58496.0).

I've attempted unpacking a fresh copy of atapi.sys (as per instructions in above) with no love (much as in the above). tdsskiller doesn't get this either.

[Shocked]

I have sort of the same problem, scvhost.exe is trying to launch malicious URL's but avast  is blocking it.