Use Virtual PC for virus testing

My approach is:

1. First, create the XP
2. Install necessary software in virtual machines
3. Place the created virtual hard disk in a secure position as the basic disk and it will not be used directly in the future.
4. Create a virtual hard disk, which is a differential disk based on the Basic disk.
5. This new disk is small. If not used, it is only 133 KB, which serves as the basis for future testing.
6. During a new test, copy the differential disk, specify the copy disk as the virtual machine's hard disk, and start the test.
7. After the test is completed, the differential disk is deleted. It does not occupy too much space.