How to check a website have affected links?

Google Ad words showing errors when submit a Ads, Its showing malicious or unwanted software.

How to check it and how can fix it?

Welcome to the forums, @ashrafnrl.

If you don’t know where the problem comes from, then it sounds as if your site has been hacked.

This article should help:
https://perishablepress.com/what-to-do-when-your-site-gets-hacked/

There is also an old post here which is still relevant:

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This could be because of many reasons. You should check the Google docs or check this site out :
https://documentation.unbounce.com/hc/en-us/articles/360001219286-Rejected-by-Google-Ads-Malicious-or-Unwanted-Software
They have links here to the doc. You need to check which one is relevant for you.

Go to virustotal’s website. Enter your site’s domain name and check if It’s infected or not. You will get a detailed analysi if your website is really having any infected links.