I keep getting redirected to Gateway google search page.

I work/play at ebay a lot. All of a sudden whenever I am there I keep getting redirected to a Gateway Google search page saying: sorry we couldn't find http://us.ebayobjects.com/1ai/ebay.us.myebaysellingsummary;dcopt..........with web search results listed. This happens ALL THE TIME. I am unable to get anything accomplished. I know nothing technical about computers + my computer is brand new. I deleted my favorites link taking me right to ebay, deleted cookies/browser history & have tried accessing ebay through typing it in to the browser and I keep getting redirected. I have Trend Micro Antivirus & Webroot spy sweeper, preformed scans on both, found nothing odd. I don't know what to do? Any help would be greatly appreciated! Thank you
P.S. I'm sure I don't even have this question posted in the correct catagory. If it should be elsewhere please let me know.

 

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http://www.thespykiller.co.uk/index.php?action=tpmod;dl=item5

Scroll down to the download section where the download button is

Save HJTsetup.exe to your desktop.

Double click on the HJTsetup.exe icon on your desktop.
By default it will install to C:\Program Files\Hijack This.
Continue to click Next in the setup dialogue boxes until you get to the Select Addition Tasks dialogue.
Put a check by Create a desktop icon then click Next again.
Continue to follow the rest of the prompts from there.
At the final dialogue box click Finish and it will launch Hijack This.
Click on the Do a system scan and save a log file button. It will scan and then ask you to save the log.
Click Save to save the log file and then the log will open in notepad.
Click on "Edit > Select All" then click on "Edit > Copy" to copy the entire contents of the log.
Come back here to this thread and Paste the log in your next reply.
DO NOT have Hijack This fix anything yet. Most of what it finds will be harmless or even required.