Which tool should be used to take charge of a system with network drive connection issues?

The correct tool to use in this situation is mstsc, which stands for Microsoft Terminal Services Client. This tool is utilized for establishing remote desktop connections to another computer over a network. If a system has network drive connection issues, remote desktop may need to be used to troubleshoot those issues directly on that system.

Using mstsc allows a technician to connect to the affected machine and diagnose the connectivity problems, whether they stem from incorrect configurations, network issues, or shared resource permissions. It provides a live interaction with the system, facilitating real-time troubleshooting, enabling the technician to check network settings or access log files that might indicate where the problem lies.

Other tools in the list serve different purposes: dxdiag is primarily used for diagnostic checks and to diagnose DirectX-related issues; msinfo32 gives comprehensive system information, which is typically more about the characteristics of a system rather than diagnosing live issues; and dfrgui is a disk defragmentation tool, which is not relevant to network drive problems. Each of these tools has its specific use cases, but in the context of addressing network drive connection issues, mstsc is the most appropriate choice.