Fifty minutes down the track and the scan is done.
388 threats in total
Adware.Tracking Cookie [388 items]
Many anti-spyware programs make a big deal of tracking cookies (virtually all cookies could be regarded as tracking cookies), they aren't a security threat, more of a minor privacy issue.
In fact I disable the tracking cookie part of the scan (Preferences, Scanning Control tab). However, what this does show is that you don't do any house keeping in regard of cookies and periodically clear them out.
Common sense is a huge part of staying clean, e.g. when you first got a notification of 'your system is at danger' or similar wording, ask yourself 'how do they know.' The simple answer is unless the alert/message comes from applications that you have installed, then they don't know and it is a scan. Having scared the person, given them a headache they offer them a headache tablet in the form of a scan, etc.
There are some real sneaky things out there that use social engineering (read scare the pants of people) to get them to do what they want, e.g. download software, visit a site, etc.
Second you need a good firewall that provides outbound protection to stop any malware that manages to get past your defences having free reign to connect to the internet to either download more of the same, pass your personal data (sensitive or otherwise, user names, passwords, keylogger retrieved data, etc. see below ####) or open a backdoor to your computer, so outbound protection is essential.
Use Firefox or Opera as your default browser as they are effectively more secure than IE as they aren't integrated into your OS, they don't use BHOs nor do they use activX (so an exploit of IE is effectively an exploit of the OS).
If you can run your system as a limited user and not an administrator account, this won't stop you possibly getting infected, but it will limit the potential for damage.
Running, Updating and scanning with SAS and MBAM once a week (fortnightly at the least) I would say it time well spent.
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This is why I told you to change your passwords, essential now we are reasonably confident your system is clean.