What's wrong with my Visual Studio?

I am learning Unity and following this tutorial:

All is fine up to the point of opening a Visual Studio. I am using Windows 8.1.

First thing. I have deleted first two lines of code (Using System.Collections and using System.Collections.Generic) but when I quit VS and open the file again, these two lines are at the top of the file:

using System;
using System.Collections.Specialized;

Next thing is, Visual Studio doesn’t give me suggestions. So I need to type out things like OnMouseUp, OnMouseDown, etc. There are no suggestions for this.

Lastly, some suggestions that I don’t need appear and change my code. For example, following the tutorial I need to type Vector3. So I type Vector3 and after I type “'.” (dot) it automatically changes to BitVector32. Suggestion for Vector3. doesn’t even appear.

The game actually works, so the code is working, but it is very annoying that I don’t get suggestions and some words just changing automatically. Any ideas how to fix it? Thank you.

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