The best and simple way is:
1. Backup your current db, websites
2. Install this wamp on different computer/laptop
3. Restore your db and website from backup and test to make sure everything work as expected
4. Uninstall all Apache, MySQL and PHP on main computer, rename/remove all related folders, run regedit to search and delete all Apache's, MySQL's, and PHP's registries
5. Restart computer
6. Install this wamp
7. Restore all db's and websites from other computer/laptop
Have fun,
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