Welcome to the Community,
you didn't mention what type/number of BSOD you see!? Assuming it's "STOP: 0x0000007B INACCESSIBLE_BOOT_DEVICE" you may try to select another virtual disk controller in the converter wizard's "Devices" screen.
For Windows XP select a "Buslogic" controller, for Windows 2003 select "LSI Logic Parallel" and for Windows 2008 R2 use "LSI Logic SAS".
André