It seems overheating. That sound could be the blowers or the HDD. What does BSOD says.
You could send minidump to Avast!.
Look for the minidump in C:\WINDOWS\minidump. compress it with ZIP, RAR or 7Zip and give it an original name.
It will also be a good idea to include a text ( use notepad ) with your e-mail and URL of this post.
Upload the minidump to
ftp://ftp.avast.com Use IE for this and follow instructions.
Or Start > Run > Copy/paste " explorer
ftp://ftp.avast.com/incoming " without quotes. Drag dump file into the ftb window.