Hi
This is not a high-end card and, for normal usage, the cpu should cope.
If you are playing games then you may well have problems as neither the graphics card or the cpu will cope with more graphics intensive games.
Some installations automatically disable the on-board - some don't.
take a look here it may help - click here
This is the minimum requirement for Win7 - 32 bit.
If you have 64 bit then 2 GB is the minimum that you should have.