Eris touchscreen doesn't work properly

Eris, unrooted, firmware 2.1

This is a "retread" Eris from craigslist, bought as a mini-tablet (wifi only). It's cosmetically fine, BUT:

The touchscreen is wonky. For example, in MARKET, nothing will make the little magnifying glass in the upper right corner do anything. And the keyboard isn't accurate - with some keys I must hunt around for the sweet spot.

I've done some hard reboots, same result.

??

 

OK.
I downloaded LauncherPro and SwiftKeyX, and then by swapping between portrait and landscape got most things done. The keyboard is still very iffy, however, and unless someone can suggest a soft solution I'm afraid it's either a digitizer or scrap.

 

On the dialer pad, the numbers "2" and "3", and the backspace, do not work.

The rest of the keys can be made to work, but they're mostly off - as though the screen needs to be calibrated. However, I cannot find any utility or method for doing that.