make touchscreen run on tablet, how to

Tablet pc: Nexox s621 (supports 64bit).
Touchscreen manufacturer: et&t (vendor can't give better info).
The tablet came with xp and vista drivers.
Problem: Touchscreen doesn't work on windows 7 (32 nor 64 bit).

Tried this:
a) installing xp and vista touchscreen driver "directly" => driver gets installed succesfully, but doesn't work.
b) installing xp and vista touchscreen driver in different compability modes => driver won't even get installed, get error message.

To some extent windows 7 recognizes the touchscreen by itself (no touchscreen driver installed).
If you touch the screen a cross or small circle appears, and can be moved.
But it appears a totally different place than where you touch the screen.
If the cross by random is placed on an icon, and you mouseclick, nothing happens.
In general all other hardware features are supported, either by windows 7 update, or
using vista drivers. Only the touchscreen and the card reader doesn't work.

A working solution for the touchscreen will be much appreciated and rewarded (small paypal amount).
Thank you.

Unless the manufacturer makes a specific driver for Windows 7, you probably aren't going to get it to work.. I know thats probably not what you wanted to hear, but you machine appears to be for XP/Vista.