From the following wordy paragraph, create a concise introductory statement plus a bulleted list with category headings.

This is to inform you that our on-site GuruGeek computer technicians can provide you with fast, affordable solutions to residential and also to small business clients. Our most popular offerings include antivirus security. This service involves having our GuruGeek protect your computer against viruses, worms, and spyware as well as help you avoid e-mail attacks, identity theft, and malicious hacker programs. Our wireless networking service enables you to share Internet access through a single wireless router so that many computer users use one network at the same time. They are all using the same network. Another popular service is data backup and recovery.

Our technicians focus on helping small businesses and home users protect their data without making an investment of a lot of time and energy.

Your Task. 

Revise the following sentences and paragraphs using lists and category headings, if appropriate. Improve parallel construction and readability while reducing wordiness.