IPhone won't connect using hotspot via USB?

I have an iPhone 4 and an acer aspire 5610Z using windows vista. I have mobile hotspot enabled on my phone but my Wi-Fi is greyed out and I don't have Bluetooth on my pc leaving me only with the option of USB. Problem is, even though my phone says it is discoverable via USB, my computer doesn't have it in the network connections options. Please help. My other computer crashed and I desperately need this one for school!

Added (1). And I do not know how to message people from here…

Well, we could set up some sort of arrangement.

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