The guest OS is reporting 100% utilization. Specifically, "WHAT" is using the CPU resources, from the perspective of the guest OS? If Task Manager is showing several application processes as the highest consumers of CPU, then you may just need more vCPU. If "System" is using a large amount to CPU, you may have another issue that is rooted in the kernel or device drivers (an actual driver problem, high I/O, antivirus problems, large amounts of open file handles, or anything that might be interacting with the kernel).
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