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You might squeeze out 1 frame per second on lowest setting.
As for half-life 1, it'll run it perfectly.
Yes half life is still in the shops with the generations pack. Gives you everything official from half life for just 20 pounds. Since its xp compatible it should work really well. But if things do go a bit wrong, you could always try and install it in windows 98 mode* in xp.
*I can't be sure its windows 98 mode, but there is a way to install it under that setting and i'm not sure how its done. Something to do with in properties, installation files and the such.
Get a new graphics card, and buy it online. But not from Currys/PC World/Dixons . this site's prices aren't bad.
You were lied to, blatantly, by the salesman. You know how it says "shared RAM"? That means it uses 64mb of your 512mb memory, in other words it's not only a bad graphics card but it's also stealing resources from the rest of the PC. The FX5200 would at least stop 64MB of that 512MB from being used, giving you the full 512MB for games. In no way is shared RAM graphics better than having an actual card.
Seriously, if it's within the warranty, and you have the receipt, take the whole thing back.
Plus tell your fiancee that there is no benefit at all to buying a PC from a big store, in fact it's actually a bad thing to do because the components they use are never as up to date as those smaller or independent stores use. Technical support is usually farmed out to some third world country because it's cheaper, whereas small stores use people who, shock horror, actually know what they are talking about (usually). One exception to this rule is, and I know many would disagree, Dell - tech support with them sucks but for a large company you cannot fault the pricing or the specs.
It sounds to me like you were looking at budget(ish) PCs, what kind of price were you looking at? Special Reserve (this site) has some pretty decent budget ones.
You should try and get a ATI 9800 Pro if you can get one cheap or a ATI 9600XT. One thing to do is to check you can take the card as its 8x AGP, should still work in a 4x AGP slot.