I accidentally deleted my driver and now cannot connect to internet?

[444]

I accidentally deleted a software named something like 'Realtek Ethernet Controller' and it has a logo of a blue crab when I was deleting my overloading softwares. Can I redone load it?

Then when I went into Google Chrome and it showed the homepage but when I search for something or opened a new webpage, the internet is unconnected.

Another possible reason is that recently I have downloaded some softwares which brought a lot of advertisements and sometimes suddenly pop out some advertising website. And every time when I on my computer, loads of software windows pop out, for example: Reg Clean Pro, Whistler, PC cleaner, Systweak Support dock, my PC backup, etc. Honestly I really didn't know how all these many softwares came since in my memory I only downloaded 1-3 softwares which I thought they were useful, but then it ended up with all these softwares which I didn't even download and the advertisements. So I was thinking if they are some sort of viruses on the computer?

I am using TP-LINK

I am using Windows 7 Ultimate

I am using a PC

Please please please help if you can! Thanks!