Computer connected to iPhone hotspot, but no internet access?

Hi. I have an HP Pavilion dv4 running Windows Vista and an iPhone 5. I used to be able to hotspot no problem. Recently, my computer has been connecting to the hotspot, but the little Earth on the two computers in the bottom right corner does not appear and I don't have internet.

Also, the computer has no problem connecting to the internet elsewhere and I can connect other devices to my hotspot no problem.

Could anyone tell me why this is happening?

RRRRRRRRRRRR

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