Lenovo has released instructions on how device owners can uninstall the harmful adware.

Superfish, a seemingly harmless pre-installed adware in Lenovo devices that were sold between Sept. 2014 and Jan. 2015, can hijack internet transactions. The company said that Superfish's purpose was " to assist customers with discovering products similar to what they are viewing."

"If they are affected, they should not use their laptop for any kind of secure transactions until they are able to confirm [the adware] has been removed," Marc Rogers, Defcon security chief and security researcher, told ZDNet.

If your device is infected by Superfish, here is how to uninstall it on Windows.

1.       For Windows 8.1, click on Search and look for  "remove program." Then select "Add or Remove Program.

2.       On the list of installed programs, look for "Superfish Inc. Visual Discovery."

3.       Those who do not find "Superfish Inc. Visual Discovery" on the list does not have it installed. But Lenovo encourages owners to check whether they have it installed in their devices.

4.       After choosing Superfish  Inc. Visual Discovery on the list, click "Uninstall." This will remove the Superfish adware from the system.

After the adware has been rmoved, the certificate is still in the system and needs to be removed next. Here's how:

1.       For Windows 8.1, click on search and look for "Manage Computer Certificates."

2.       When prompted, "Do you want to allow this program to make changes to this computer?", click "Yes."

3.       After clicking yes, the certificate manager window will apper. Choose "Trusted Root Certificate Authorities" on the left panel, then the sub-folder "Certificates." Look for the item that has "Superfish Inc."

4.       Right click on "Superfish, Inc." then choose "Delete."  For touch systems, users can select the red "X" on the top toolbar.

5.       When prompted to confirm deletion, choose "Yes."

6.       Restart your Lenovo device.

The above instructions should remove the Super Fish certificate from Google Chrome, Internet Explorer, Safari, Maxthon, Opera, and other browsers that use the Windows Certificate store.

According to Lenovo, new devices no longer have the Superfish adware.