Yesterday I started getting ads when I clicked on my browser - it doesn't have to be a link I'm clicking, just any kind of clicking at all. It seems to be trying to open popups as well, but my browser is blocking them. Initially, it didn't happen very often, but it seems to be getting worse. Generally, the browser will act normally for a few minutes and then spawn ads (generally for... pc cleaning and virus removal software, haaa) for the next 3-5 clicks, and then go back to normal.
I'm using Google Chrome on Windows 10.
What I've already tried:
Malwarebytes AntiMalware - This tends to turn up two infected files (PUPs) associated with the Crossrider adware. But no matter how many times I remove them, they just come back.
Hitman Pro - This turned up a bunch of tracking cookies, but is currently coming up clean.
avast Browser Cleanup - When I start this, I get the following message:
The toolbar protector "lstartsurf" has been detected on your system. It is recommended to completely remove it from your system, otherwise the results of avast! Browser CLeanup might not be reliable.
However, even when I say to remove it, the same message comes up when I open it again. Also, it seems to be unable to detect my Chrome addons, because the screen is blank even when I unhide the good addons. It detects addons from the other browsers just fine.
ADWCleaner - coming up clean.
Spyboy Search&Destroy - This won't even let me scan the system - the option is greyed out. It also tells me I'm missing signatures, "including Adware-C.sbi"
Malwarebytes Junk Removal Tool - it removed some junk but not this, and not lstartsurf, apparently.
Not sure what else to try at this point. Thanks in advance for reading/potentially helping with this.