Can i take my older dell inspiron 710 and activate a touchscreen?

Password for what? Windows? an App?

You aren't the only one! These are searched for a bit. Here is a link that has some info but it is for 4.2 manuals:
Android 4 2 Manuals

the settings have to be different. check the user name and password on tablet, and make sure they are same on laptop

You will need to replace the digitizer, this is not a easy repair if you don't know what you're doing.

It's on a sticker on the bottom of the laptop

on some notebooks if you hold shift control then zero it should resset the bios passwaord to get back in.. serch the del site for your model nad it should give you tips on how to do it .. but i know for toshiba that is works remember contol+ shift +zero should reset pw.

Hmmm does the penn have a battery then? I guess something is wrong with the wiring as not just the pen does not work but touching all all not. Stuff should just simply work and not require loads of troubleshooting.

http://www.it-battery.com/dell-xps-m170-laptop-keyboard-p-791.html

http://www.it-battery.com/dell-inspiron-8600-laptop-keyboard-6w610-1m745-p-808.html
(low price ,high quality)
Change a keyboard.