Here's another reason to upgrade that old Windows XP PC: Microsoft has now stopped providing antivirus signatures for the out-of-support operating system.
Even after support for the venerable OS ended in April last year, Microsoft continued to provide its malicious software removal tool and updates to Microsoft Security Essentials - that is, until yesterday.
It has not been possible to download Microsoft Security Essentials for Windows XP since the end of support, but PCs with it already installed have been receiving anti-malware signature updates for the last 16 months. Because the malicious software removal tool is connected with the company's anti-malware engine and signatures, that has also remained working.
Windows XP security just got worse again