I have a windows 7 laptop and over the past month or so I've been noticing some pretty slow performance, especially when browsing the internet. It seems to be running more slowly than it ever has. I've also noticed that the CPU light seems to be "blinking" almost continuously, even when I haven't been doing anything on the computer for a couple minutes. This never used to be the case.
In addition, several of my credit card accounts have been comprimised over the past few months, the most recent one being today where one of my online accounts was hacked. It's making me wonder if I have some sort of malware on my computer that's comprimising my security.
I run Malwarebytes, and until about two weeks ago, McAfee virus. I upgraded to Windows 10 a couple weeks ago hoping that may make things better but it didn't. The upgrade made me delete McAfee and casued some other driver issues with my laptop. After a day or so I reverted back to Windows 7 by rolling back the Windows 10 update.
The last time I ran Malwarebytes (~two weeks ago) and McAfee (~a month ago) it didn't find any significant issues.
Suggestions or guidance on how to verify my computer isn't infected with malware, and how improve its performance overall would be greatly apprecaited.