10 Free Online Diagnostic Tools
Online diagnostic tools allow you to diagnose and troubleshoot your machine (or someone else's) without having to install extraneous software, or run scans on suspicious files or links without having to plug in an antivirus suite. While they're not quite as powerful as dedicated software and they have to operate through a browser layer, online tools can provide some extra utility and can help you track down issues with your hardware, software, or internet connection. They can even scan for viruses and malware. Here's a list of a few helpful online diagnostic tools.
Note: Many of these free tools are provided as companions and gateways to paid diagnostic and security software, so don't be surprised if you're nagged to purchase a company's full internet security suite or paid benchmarking tool.