Does anyone know if I can use bluetooth to take my internet connection from my downstairs pc to my upstairs pc, as like a wi-fi equivilent?

Probably, but it would be complecated, I think. Also, bluetooth tends to be short range, insecure and expensive, so why would you want it over wi-fi?

cos i cant afford wi-fi (unless i can set one up for around ?40 (no router needed))

And bluetooth is more expensive than wi-fi...

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Thats weird, i was looking at that before you posted it

LOL, well it's only just ove ?40 (80p, IIRC), and would be much better than bluetooth.

Bluetooth is a dying technology, with transfer rates typically under 1mbps.

well, if u had a mac, built in bluetooth, wireless(airport) and more, easy connection, and built in HTTP server, unfortunately, my network makes this tricky to use, but if we were macs networked together, I CUD USE IT

Wi-fi is still a far superior technology. I wouldn't trust a bluetooth network, especially with their lack of security.