Vince, that's a decent machine. The mainboard has an Intel P965 chipset, which supports all Intel Core 2 Duo CPUs, including the quad cores.
The Maxtor drive is decent, but 160 Gb isn't all that much these days. On the other hand, installing an extra hard disk is fairly easy, and you can have a 300 Gb SATA II disk for around € 75
Same goes for memory: 2x512 Mb isn't really much, but the mainboard has two additional slots for memory, so you can easily upgrade to more (put in another 2 x 1 Gb and you'll have 3 Gb of memory in total, which should work very well with both Poser and Vue.

nVidia is phasing out the 7xxx series of graphics cards in favor of the 8xxx series. Not that the 7600GS isn't a good card - it is - but it does not support DirectX 10, which means that its performance under Vista will be not as good as an 8xxx series card of the same price.

I'd say the configuration is not bad, but also not very competitive. For Poser/Vue, I'd recommend more RAM and a bigger hard disk.

Actually, for just a little more money ( € 850) you can have a system with the following specifications:
CPU: Intel Q6600 quad core (twice as fast)
4 GB RAM DDR2-667 (DDR2-800 doesn't give you more performance, but does cost more money)
Seagate Barracuda 7200.10 (320 GB SATA II harddisk)
DVD +/- RW optical drive
Floppy drive
nVidia 8500GT Silent graphics card (abut as fast as the 7600 GS under XP, but much faster under Vista)
MSI P965 based mainboard (great quality, and silent)
Arctic Cooling Silentium T2 Pro system case with 500W power supply unit - more than enough to run this system and you can always add extra components (extra hard drives, for example).

In short, a system that blows the one you mention out of the water. Twice as fast, at least.

In the Netherlands, there are several stores where you can specify what components you want to have in your system, and the store will build the system to those specifications. Usually, such a system delivers more bang for the buck than the typical ready-made system. 
The main reason is that the ready made systems are geared towards gaming. Usually that means less RAM than you'd really like, a graphics card that is relatively overpowered, and less disk space than is useful.

Probably this kind of store also exists in France. I'll gladly help you specify a system that will be REALLY fast for Poser/Vue work, and that's still within budget.

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