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As 64-bit processors become increasingly prolific, so do 64-bit installations of the operating system. However, most software is still written in 32-bit, which shouldn’t cause any significant problems for most end-users. However, if you need to modify or remove the registry entries for a 32-bit program, you won’t find it where you expect to.
The reason for this is that all registry entries for 32-bit software are placed in a separate folder. In order to view them, you need to locate the node called Wow6432Node: