we already talk about crash dumps about a week ago there is a lot of infomation on it if you search the community.
as for the No I/o error try this
Activate the viewport in which the background image is visible.
On the Views menu, choose Viewport Background.
Notice the name and path of the background file is displayed in the Current field in the Background Source group
In the Background Source group, click Devices.
On the Select Image Input Device dialog, choose No I/O Handlers from the drop-down list, then click OK.
On the Bitmap Manager Error dialog, click OK.
The current field no longer displays the background file name. Instead No I/O Handler is listed in the Current field.
Click OK to close the Viewport Background dialog.
Next time you open up the Viewport Background dialog, no file name will be displayed in the Current field.
TipThis technique will work only on systems that don't have any other Image Input Devices installed.