Malicious code is any code designed to have an effect that is unintended by the receiver.
Viruses, Spyware and Malware are three examples.
Virus: Any code designed with the intent to damage files or disrupt hardware on a computer and to pass itself to other computers with the same intent.
Spyware: Code designed to track your usage on the internet and to deliver that information to outside marketing computers and advertise services to you.
Malware: Code designed to steal personal information such as usernames, passwords, bank account info, credit card numbers and report that information to people who may use your financial information to steal from you.
Other types may be called trojans, backdoors, worms, spyware, adware, or bloatware.
malware
spywareGrayware
Two of the best anti malware scan at present are Malwarebytes Anti-Malware Superantispyware
Two great programs for malware removal is Malwarebytes.com and A-Squared, they are both free programs that can be easily downloaded online and installed.
Malware Malware
Malware do not download
A free malware removal tool helps you identify and remove malware from your computer
give me two examples of hardware
Glucose and starch are two examples of carbohydrates.
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Spyware Examples Keyloggers - eg SpyAnytime Form Fillers - eg GATOR Trackware - eg n-CASE Downloader - eg Exploit Cookies Adware
Viruses are a kind of malware. Malware is basically, as the name suggests, malicious software that can affect your computer. There are some easy to understand sources about what is malware and viruses in the related links.