Considering the complexity of computer hardware, software, and communications systems, you are going to need IT services to assist you if you run into a technological roadblock.
For example, creating a reliable and secure network is important to a company, be it big or small. Your employees need to be able to access their emails and whatever proprietary software they need to get the work done for the day. Access also needs to be granted to any offsite or telecommuting employees that are part of the company. Related to this is the fact that the network you are using requires security measures, both physical and virtual, be installed to prevent unauthorized use by outsiders. IT experts can provide these services.
What IT professionals can also do is get rid of any viruses, malware, and spyware that may have affected your computers. While some of these things are merely annoying, i.e. random popup ads, others can be devastating to have on your PCs, i.e. viruses that may delete important documents or even software. Worst yet are viruses that can steal sensitive information from your computers and send it to unscrupulous individuals. These are the types of things you need to be protected from.