How to use laptop as a hotspot modem FOR my iphone?

Guys, i know we can use iphone as a Hotspot Wi-Fi modem for other phones or laptops to go on internet.
My question is can we do the other way round, Can we use laptop's internet connection (through usb cable or Wi-Fi or Bluetooth) as a hotspot modem for iphone?

Situation:
I don't have Wi-Fi internet here in the office. Only cable internet is available.
i want to use viber/use whatsapp/surf internet through my iphone cuz i don't have data internet function in my phone network as I'm out of my home country. So I was thinking if we can use iphone as a Wi-Fi/cable modem for laptop all the time then there must be a way to use internet connection available on my laptop to be used for my iphone too.
Is it?
how.
thank you a lot.
Best wishes,
Imran

Added (1). I'm using windows 8.
But if you have info for Win XP or/and win 7, please do share too. Thank you

Added (2). Guys,
I got easier solution:
http://lifehacker.com/...fi-hotspot

Software:
http://virtualwifihotspot.codeplex.com/releases/view/101496

Its quick, simple and easy.working fine.

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