pci-e x1 adapter?

PCI-E x4 will allow the use of PCI-E x1 cards, but not vice versa IIRC. PCI-E is not compatible with PCI in any way.
 
PCI-2 2.0 is irrelevent to this really. :)

PCIe 2.0 motherboard slots are backward compatible with PCIe v1.x
PCIe 2.0 cards are compatible with PCIe 1.1 (bar some chipset issues)
 
Technically, there are some single chip PCI - PCIe bridge solutions so it should be possible to build an adapter without too much difficulty. physically getting a full height card plus adapter to fit is another story.
 
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