I get this message after restart, or cold start (not sure I recall getting it while clicking around). It continues: "Your installation is either corrupt or has been tampered with. Please uninstall then rerun setup to correct this problem."
I reinstalled my system a short time ago due to problems, but it still performed poorly/slowly/freezing/not responding. I always had antivirus/malware stuff...MSE, CCleaner, MalwareBytes, Super Antispyware, Spyware Blaster.
I also often get a message: "Security Warning...Do you want to view only the webpage content that was delivered securely? This webpage contains content that will not be delivered using a secure HTTPS connection, which could compromise the security of the entire webpage."
So much aggravation and frustration, about ready to 'byte' the bullet and buy new comp, thinking some of the innards have just plain worn out to the point they make things operate erratically. Comp is 5 1/2 yrs old, XP.