BSOD due to Avast file(???)

[ashgail]

I experienced several BSOD in the past few days and was hoping for insight. One of the files appears to be an Avast file and was wondering if this is a known conflict or other(virus)
The following are the specs on computer and minidump info for corresponding days.

Windows Vista Business
2007 Microsoft Corp
Service Pack 2
Intel Core 2 Duo
HP Pavilion
I use the free version of Avast and Windows firewall.

Minidump files
April 3
**first crash: Probably caused by : aswFsBlk.SYS ( aswFsBlk+14b5 )
second crash: Probably caused by : ntoskrnl.exe ( nt+b0def )

April 5
first crash: Probably caused by : ntoskrnl.exe ( nt+bbebb )
second crash: Probably caused by : afd.sys ( afd+18d48 )

[Lisandro]

Please, go to folder \windows\minidump and send the newest (recent) .mdmp files for analysis.
There is also C:\Windows\Memory.dmp file.
Better if you can compress (zip), rename it with an unique name, them and add some information about the BSOD and the link for this thread. 
Upload it to this anonymous ftp server: ftp://ftp.avast.com/incoming/