There are several computer viruses known to imitate an update for Adobe Flash Player. The Trojan.Ransomware virus generates a pop-up that instructs you to click a link to obtain an activation code for the latest Adobe Flash Player update. As soon as you click the link, a barrage of additional pop-ups will appear and your computer will slow down. Another virus installs DefaultTab and several other unwanted add-ons to your Web browser.
End all processes related to the Flash Player virus. Hold the "Ctrl" and "Alt" keys while pressing "Delete" to access the Windows Task Manager. Select the "Processes" tab and look for an item titled "Trojan.Ransomware" in the list of active processes. Select the item and click "End Process" to terminate it.
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Click the "Start" button and select "Run." Type "regedit" and press "Enter" to open the Windows Registry Editor. Right-click on the item titled "HKEY_LOCAL_MACHINE\Software\Trojan.Ransomware" and select "Delete" to remove it. If you cannot find this item in the list, click "Edit" and choose "Find." Type the name of the registry item in the search box and press "Enter." Delete the item and close the registry editor.
Search your computer for any other files that may be involved in the virus. Type "Trojan.Ransomware" in the search box and do not press the "Enter" key. Delete all of the files that come up in the list of search results. Restart your computer to finish the virus removal process.
Click the "Start" button and select "Control Panel." Select "Uninstall Programs" and look for the following items in the list of installed programs: DefaultTab, DownloadTerms, LessTabs, TidyNetwork.com and WebCake. Uninstall each of these programs and any other unidentified items that were installed on the same date as the others.
Open each Web browser that you have installed on the computer and look through your list of add-ons. For Internet Explorer, select "Tools" and "Manage Add-ons," then choose "Toolbars and Extensions."
Close your Web browser and restart your computer to complete the process.
Install anti-virus software and a spyware scanning program to prevent your computer from being infected again.
Backup your registry before making any changes through the registry editor. If you make an error, your computer may not be able to turn on or start Windows properly.