Please backup your data and applications before performing a factory reset, so you can restore it post re-installing BlueStacks.
Article on Backup and Restore BlueStacks:
Follow the steps mentioned below to factory reset BlueStacks (Resetting all settings & delete all data on BlueStacks):
1. Click on 'Settings' option and open 'Preferences'.
2. On BlueStacks Preferences, open 'Data' tab and click on 'Factory Reset' button as shown below:
3. A pop-up will appear, click on 'Yes' to completely erase all your apps and data.
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