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In general: the integrated video on the motherboard has 64 MB, the processor is a Celeron 2400 MHz. There is 256 MB of RAM, which is not enough (I struggle with my 512 MB, and there's not much you can do with 256 MB). Is it an office computer? It doesn't look like a home computer, but that's not the point. The whole system needs to be replaced (or upgraded). You need to buy a video card, 1024 MB of RAM, and the processor is fine! That's basically it!
Added 6 minutes later
I think a video card from ATI 9600 or higher, or from nVidia, 6600 GT or higher!