@ManyQs: u did not read the whole article... theres one part which says this.
quote: "1. Can I have more than one real-time anti-malware product installed?
No. Having more than one real-time anti-malware product installed will compete with other anti-malware product(s), and can cause severe performance problems and system instability issues, and may limit the effectiveness of the products installed.
Even if you attempt to have more than one product installed, with one active and another disabled, the disabled product will likely still have active components and/or drivers installed that will conflict with MSE. The important issue here is that any other product with real-time scanning will conflict with MSE (or any other real-time product).
However, you can have an on-demand scanner, such as Malwarebytes, installed. Malwarebytes offers two different scanners – one on-demand (free), and one real-time (paid). The on-demand scanner does not conflict with MSE’s real-time scanning."
i hope this ends this once and for all...official statement from
http://experts.windows.com/w/experts_wiki/89.aspx .
it even states specifically u can use malwarebytes on-demand
(just how popular is it?)
edit: if u cannot find this quote, please scroll down the page to the faq section