Open Task Manager and end any processes and services that seem suspicious. Then, disable the services in the Services console.

First, you can try to reinstall the anti-malware client software. Second, if the computer is running too slowly to install this software, you can perform an offline anti-malware scan from a bootable CD if you have such a CD available. Finally, you can start an anti-malware scan from over the network, such as from an online source or from a local server that hosts your anti-malware software.