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Anti-virus software was originally developed to detect and remove computer viruses. However, with the proliferation of other kinds of malware, antivirus software started to provide protection from other computer threats. In particular, modern antivirus software can protect from malicious browser helper objects (BHOs), browser hijackers, ransomware, keyloggers, backdoors, rootkits, trojan horses, worms, malicious layered service providers (LSPs), dialers, fraud tools, adware and spyware. Some products also include protection from other computer threats, such as infected and malicious URLs, spam, scam and phishing attacks, online identity theft (privacy), online banking attacks, social engineering techniques, Advanced Persistent Threat (APT), botnets and DDoS attacks.
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Second. what kind of resources do you have on your PC? When the PC is fully up, open Task Manager and take a look at the Performance tab. See how much RAM is being used vs how much is installed and then look at the processes tab and see what's using the most CPU and RAM. This will give you an overview of how things are running.
You probably don't need both McAfee and SWD if you're running the newest one because it has a fairly nice antivirus program built in.