XP "Power Usage Plan" shows gray (not available) solution

xp power usage option is not available, power management power scheme is gray, repair method: I accidentally found my power management solution choice turned into today Gray, remember not to make any major changes, it may be a problem when deleting some plugins. Attach a workaround:
Symptom You have turned on “Power Options" in Control Panel on your Microsoft Windows XP-based computer. However, the Power Scheme option displayed in the "Power Scheme" tab is not available.
Cause This issue may occur if some or all of the registry keys associated with the power scheme option are removed.
Solution Method 1: Use the Powercfg.exe utility to restore the default power scheme You can use the Powercfg.exe utility to copy the power scheme from the “default user” configuration file to the currently logged in user. This can be done because the power usage scheme associated with each user account is unique. To copy a power scheme from the default user using the Powercfg.exe utility, perform the following steps: 1. Click Start "Start" and "Run", type cmd, and then click “OK”.
2. At the command prompt, type the following command and press Enter: powercfg /RestoreDefaultPolicies
Method 2: Use the Powercfg.exe utility to import the power scheme from another Windows XP installation. You can use the Powercfg.exe utility to export a power scheme from a parallel Windows XP installation or from another Windows XP computer and then import it into your original Windows XP installation. To do this, follow these steps: 1. In a new Windows XP parallel installation, or on another Windows XP computer, perform the following steps:
a. Click “Start” and “ ”, type cmd, then click “OK”.
b. At the command prompt, type the following command and press Enter:
powercfg /export <scheme>> /file <file>
Note: In this command, <scheme> Indicates the power scheme to be saved. In addition, <file> indicates the path to the file name used when saving the power scheme. In the current situation, the file will be saved to the location where the original Windows XP installation files were saved.
2. In the original Windows XP installation, do the following:
a. Click “Start” and "Run", type cmd, and then click “OK”.
b. At the command prompt, type the following command and press Enter:
powercfg /import <scheme> /file <file>
Note: In this command, <scheme> means Imported power usage plan. In addition, <file> represents the file name of the power usage scheme. In the current case, this file is specified as a file saved before this process.
3. If you want to export and import more power usage scenarios, repeat all previous steps.
4. Verify that the imported power scheme is currently available in the "Power Scheme” tab
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1. Click “Start” and "Run", type cmd, and then click “OK”.
2. At the command prompt, type the following command and press Enter: powercfg /RestoreDefaultPolicies