Everytime I visit Gmail, Facebook, YouTube, or Yahoo mail, I get a popup "Please update Internet Explorer" (while I'm using Chrome!). I don't have screenshots but this website describes the problem.
I followed all steps but it had no impact. I also ran a few virus scans using Kaspersky, then uninstalled Chrome and Firefox and re-installed them, but the virus persisted.
I took a backup of all my data and formatted the entire hard drive - including non-system partitions - and re-installed Windows 7 with all the required drivers. I used Internet Explorer but the problem persisted. I have a Kaspersky firewall and antivirus, and MalwareBytes, but neither can detect any malware.
I reformatted and re-installed again, to no avail: the problem is still there. I have no idea what to do. My computer technician basically tried the same things, but he couldn't fix it either.
I'm really stuck and don't know how to proceed.