it's the card you blug the cable of your monitor in.
Anyway, better idea then before - this reinstallin could have disrupped the whole interup thing. You can check that in Hardware/hardware manager and then details for your graphic card and all other devices. The IRQ has to be unique, but I guess your graphic card has no own ICQ cause something else is usin it, check that.....and change it if you can spot 2 same entries.
if that doesn't work you could try 2 open your Pc and insert the card in another slot like I told you before. But I guess it's better to try opion #1 first before you open you PC - if not I guess that's what you have to try (see above)