I too receive this error when I run the boot time virus scan.
“Master Boot Record 0 Error 0xC0000013”

I think it’s how our systems are set up. I have an Asus A7n8x-Deluxe mobo with 2 Maxtor SATA 120GB 7200rpm drives connected to the SATA controllers of the mobo. They are set in a Raid 0 config (Data Striping). I have partitioned the 240GB array into a 40GB drive C and 199GB Drive D (for My Documents).

I only get the error when I run the boot time scan.

Can an Avast tech confirm my assumption?