How to reset the Internet browser proxy configuration:

Malware sometimes changes the proxy server configuration to allow it to redirect your browsing requests. After the malware is removed, the proxy server configuration is not reverted and needs to be reviewed. Usually, no proxy server is used. Please consult your ISP or network administrator if you are unsure.
Here you can find short guides on how to change browser's proxy server configuration. If more browsers are used, be sure to check the proxy server configuration for all of them.

Internet Explorer and Chrome (system proxy)
1. Press Windows logo + R
2. Type inetcpl.cpl into the opened window.
3. Click the Connections tab.
4. Click LAN settings.
5. Clear the Use a proxy server for your LAN option if you do not use a proxy server or make any needed changes.
6. Click OK to save any configuration changes.
7. Click OK to close the Internet properties window.

Mozilla Firefox
1. Open the Firefox browser and click the Firefox menu in the upper-left corner.
2. Select Options -> Options.
3. Click the Advanced icon in the upper-right corner.
4. Click the Network tab.
5. Click Settings.
6. Select the No proxy option if you do not use a proxy server or make any needed changes.
7. Click OK to save any changes.
8. Click OK to close the Options window.

Opera
1. Open the Opera browser.
2. Press CTRL + F12.
3. Click the Advanced tab.
4. Select the Network item in the left list.
5. Click the Proxy Servers... button.
6. Make sure all options are cleared if you do not use a proxy server or make any needed changes.
7. Click OK to save any changes.
8. Click OK to close the Preferences window.