>>>malwarebytes is great, but it cant find webssearches
Have you tried running it in Safe Mode?
>>>firewall, i haven´t a clue, could you tell me how to find out please.
By default, Windows 7 own firewall should be running on your computer. Here's how to turn it off and back on again:
http://windows.microsoft.com/en-gb/windows/turn-windows-firewall-on-off#turn-windows-firewall-on-off=windows-7
However if you've installed a full security
suite, such as Norton or the paid-for version of Avast, (rather than just a standalone anti-virus program) that software will have probably disabled the Windows firewall and substituted its own. You'd need to go into the settings for that security suite to disable/enable the new firewall.