Display driver issues on Vista to XP downgrade

[willyontour]

I have an ACER Aspire 5100 laptop which came with Windows Vista AMD Turion 64 X2 and ATI Radeon Xpress 1100 graphics card.

I had enough of Vista so I installed XP on the machine.

Now, my VGA output doesnt seem to work.

In my device driver there are no longer any display drivers listed.

I have tried to reinstall the ATI display driver but it keeps saying my system is not compatible.

Is there anyway I can get my VGA output working again?

Thanks