Ok, you may not have unchecked the option to trial the PRO version of MalwareBytes when you installed it... it may just be that which has expired?
No matter...
You should still have the 'Free' version anyway, On my system its default location is:
C:\Program Files (x86)\Malwarebytes' Anti-Malware
[NOTE: If you use the latest version it will be missing the apostrophe after MalwareBytes]
The file to run is mbam.exe (32 bit)
If it will let you, update Malwarebytes.
The new default install location is:
C:\Program Files (x86)\Malwarebytes Anti-Malware
[NOTE: The update actually creates a new folder, same name as before but minus the apostrophe....and it will empty (but not delete) the old folder.
If you want, completely uninstall Malwarebytes, download the new version and install it....it won't hurt...just remember to UNCHECK the option for the PRO TRIAL.
It should install to the folder mentioned above....without the apostrophe.
When you run it its best to disconnect from the internet, (or disable the LAN card), AND disable your anti-virus.
Some anti-virus will prevent changes to the registry where most malware will hide...which is why you can't find it, and for MalwareBytes to Quarantine any infections it needs access to the registry.
Try that first and we'll take it from there.
Absolutely!
What better way to get your money from you than to claim a 'Fix All' solution.
Most of this software 'Fakes' the results in an attempt to fool you into thinking you have more problems than you actually do.....the 'trial' software will probably claim 100's of problems that need 'fixing' but will only 'fix' them if you pay for it.
Inevitably the software will do more than any FREE software, but by the time you realise it they've got your cash! (And couldn't care less about your problems neither!)
There is some software that will actually INSTALL viruses ONTO your system!
What better way to spread a virus than to attach it to software that claims to remove viruses? (Or not in reality)....AND you PAID FOR IT!
Nasty people are sneaky beyond belief.
Regards.
MrTom.
PS. You still didn't tell me which browser you use....and that's where the problem is isn't it? 
