How to Virtualize iOS on a Windows 7 computer

First virtualize MacOS X, inside then iOS with XCode. See http://www.macbreaker.com/2012/07/mountain-lion-virtualbox.html

Yes you can, you need to virtualize OSX inside you Windows, and then use XCode as the other stated, however it doesen't work with nearly all AMD CPU's but i think Dell uses mostly Intel. And a Mac costs alot. For example i don't have money for one, the cheapest one costs $1,600 where i come from, but if you are going to get a Mac, i would wait for that.

But they really are expensive, and i only need a Macbook for debugging.

While it is technically possible, I'll tell you from experience:

To run Xcode and the iOS Simulator, you will need to have MacOS running. Oficially it only runs on Apple Hardware, buuut, you can always use virtualizers and Hackintosh. There are plenty of good tutorials online if you choose this method.

My advice: DON'T do it!

When I started to develop iOS apps, I had a Windows PC, but after trying lots of different approaches to virtualize MacOS, with none I had great results. I bought a MacBook on a sale, and it's just a better iOS development experience overall. It's priceless not to have to deal with driver searching and compatibility issues.