Well, windows blinds is alright, but it takes up resources. Should you choose to rollback your theme. Uninstall the application you used to allow Windows 7 type Aero Theme on XP. Afterwards, you might need to reapply your old theme settings by following this:
Open your control panel then open Display.
Click the appearance tab.
Select your preferences, be it Luna or Classic.
You may need to change icons and font, that's done here.
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