Lenovo is offering customers a tool to help them remove pre-installed software that experts warned was a security risk.
The Superfish adware program, which offered shopping tips, was shipped on some of the company's notebook devices.
On Thursday Lenovo said it had disabled it because of customer complaints.
A statement later said the company was also aware of security risks about the software and the company was focused on "fixing it".
The company said: "We apologise for causing these concerns among our users - we are learning from this experience and will use it to improve what we do and how we do it in the future."
Lenovo said it had acted "swiftly and decisively" and that users could download a patch to remove Superfish.
Superfish was auto-installed to help users find products by visually analysing images on the web to find the cheapest ones. Users had initially complained about intrusive pop up ads appearing on their browsers.
Computer experts later warned that the software was potentially compromising their security.
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