My Canon printer stopped scanning and faxing. I called Canon and a "diagnostician" told me my network had a csrss.exe.trojan. Numerous Microsoft programs were turned off, many warnings showed up etc. My computer has been quite slow for a while. Now Canon wants to sell me a 1-time fix which includes a network shield and guarantee to have everything working. For $100 more, they offer a year guarantee with unlimited tech support etc. Is this legit and/or a good idea. He said the trojan is in the network, not the computer. I can get my computer fixed at school for free. Is Canon offering a good service?
Software/Hardware used: Windows 7, HP computer, Canon Printer