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Using just your keyboard, it is possibly to navigate the screen.. But its very difficult.
You can use the arrow keys to select items, and the enter key to open then.
The main key is the tab key, as you press the tab key it will cycle between areas on the screen.
if you press the tab key a whole bunch of times, you will see what you have highlighted move from item to item. The the arrow keys and enter key can help you select and open them.
Honestly though, your best bet is a generic usb mouse that doesnt require any special drivers.. As this will work as soon as you plug it in.
You can get one at a very cheap price online, such as here. http://amzn.to/1TBMn7z
That mouse will run as soon as you plug it in, without needing to install anything. That will at least allow you to select things and run any software repairs you need.
If you have further questions, let me know.
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