It's been like this for a couple of months now, actually

Before I log into XP, it works fine (at the user selection screen), but as soon as my personal settings are loaded, it stops working. I hadn't fucked with the settings, I tried reinstalling it, updating the drivers, etc. Nothing helps.
I have a Lifetec LT 9310 Grafik Tablett.
I don't quite want to buy a new one since this one isn't broken, there's just something wrong with the configuration or whatever.

Please help

Hm, don't know if this works, but look up how to delete the registry entry for your tablet drivers, then reinstall.

http://www.medion.de/?service_~u~_support.html

Send em an email bro.