Can't access any websites in all browsers - after virus removed

Hello,

My Internet has been working fine on all my browsers (Firefox, Chrome, Internet Explorer) on my Windows 7 computer until today. But after trying to remove delta-search from my browsers, I can't access any websites on any browsers. I'm having to write this from an iPad as my computer's browsers are not functional anymore, and so it's impossible to browse the Internet from there.

I was trying to remove delta-search from my computer, and followed this walkthrough to remove it: http://malwaretips.com/blogs/remove-delta-search/
I don't know much about computers, and so I found it really simple to go through.

Delta-search successfully stopped appearing in my new tabs in Firefox somewhere after Step 3 on the walkthrough (running AdwCleaner) and Step 5 (the first scan of HitmanPro). That's when I was using Firefox for a short period of time, and so noticed that delta-search wasn't appearing in new tabs - Firefox was still functional at this point. Malwarebytes (Step 4) couldn't have caused the problem as it didn't find anything in the scan.

I ran a default scan of HitmanPro three times, one after the other - just to be on the safe side. It removed a large number of cookies from Firefox and Chrome and "traces" firstly, and quarantined four items in mu Downloads folder. On the second scan, I noticed that delta-search was found with a little grey shield icon next to it - though the program did not automatically suggest deleting it - I had to choose that option manually. Along with delta-search, there were two similar potentially unwanted program's with the title Claro. I chose to remove these too.

The last scan did not find anything else. I then went on Firefox and found that no matter what website I would try to access, the error Server not found would appear. A similar issue happened on all three browsers on my computer.

The locations of the items I chose to delete within HitmanPro were:
C:\Users\Bethany\Appdata\Local\Google\Chrome\User Data\Default\Extensions\eooncjejnppfjjklapaamhcdmjbilmde\ (Delta Search) -> Deleted

HKU\S-1-5-21-3025427602-3857726500-444173145-1000\Software\Microsoft\Internet Explorer\Approved Extensions\{4D2D3B0F-69BE-477A-90F5-FDDB05357975} (Claro) -> Deleted

HKU\S-1-5-21-3025427602-3857726500-444173145-1000\Software\Microsoft\Internet Explorer\Approved Extensions\{98889811-442D-49DD-99D7-DC866BE87DBC} (Claro) -> Deleted


I think that removing something with HitmanPro must be the cause of this issue - I can't think of anything else, seeing as I'm sure my browsers worked fine before running scans with the HitmanPro program.

Thanks in advance for anyone who comments and can help figure out the solution!