Cybersecurity firm Kaspersky has uninstalled its popular antivirus software from U.S. users' computers, automatically replacing it with a completely different program from completely different company UltraAV. Kaspersky customers are not happy.

After U.S. ban, Kaspersky's American customers were automatically migrated to UltraAV antivirus, in some cases without the customers' knowledge.

Customers in the US using antivirus software from the Moscow-based cybersecurity company Kaspersky are finding that the software has been deleted and replaced by antivirus protection from a different company,

Some US Kaspersky security users got a big surprise when their protection was suddenly replaced by UltraAV due to a government ban. But Kaspersky’s demise has been looming for years.

Kaspersky deleted its anti-malware software from computers across the United States and replaced it with UltraAV's antivirus solution without warning.

Some US-based users of Kaspersky antivirus products have found their software replaced by product from by a low-profile entity named "UltraAV" – a change they didn't ask for, and which has delivered them untested and largely unknown software from a source with a limited track record.

Kaspersky's antivirus software deletes itself across the US and installs UltraAV instead without notifying customers. Some are frustrated and struggling to uninstall the new program.