a very good free program you can use in addition to your antivirus to make sure you don't have any infections is malwarebytes, As Zep said I do not think this is from an infection, but it is always good to get malwarebytes, update it and run a full scan, do that once a week or so. Malwarebytes' Anti-Malware (Win) - Detecting and Removing Malware

You will want to check these settings in cleaner and uncheck the approiate one. Other applications and utilities Applications - These refer to third-party applications you've installed that don't fall under the Internet, Multimedia, or Utilities category. Some examples are CD/DVD-burning programs and word processing software. Internet - These programs include browser add-ons such as Flash and the Google toolbar, instant messaging programs, and firewalls. Here is a link that might be useful: ccleaner

I thought I had upgraded to IE7 at one point. Yahoo wants me to upgrade to IE8, but after reading about it here, I was reluctant to do so. I did go to windows updates last week to see if there were any I needed to do, but after scanning it said there were none. How do I get IE 7?

To completely disable your ToolbarÂs search history Select the "Options" button on the Toolbar Un-check the box next to "Drop-down search history" To simply clear the current search history: Click the Google logo to access the drop-down menu Select the "Clear Search History" option