Do you get any errors when you install? This is important to know...
Please try this version of malwarebytes: Click the link here
Save it on your desktop
. You'll see it will have a random name, and will look similar like this:
Doubleclick on it, so it will extract the files and will start Malwarebytes automatically.
In case the installer (random named file) won't run either, rename it to EXPLORER.EXE and try again.
When Malwarebytes opens, click the "Update" tab FIRST and select to check for updates in order to get the latest updates.
In case Malwarebytes doesn't open, search for the folder mbam-installer
on your desktop, open it and doubleclick the file winlogon.exe which will be present in there. This should launch Malwarebytes.
Then perform a scan and let it remove what it found. Reboot afterwards (important).
After reboot, post the malwarebytes log together with a new HijackThislog.
In case you're having problems with above instructions, let me know.