Windows XP comes with builtin support for uncompressing zip’d files. If you prefer to continue using a dedicated utility like pkzip or winzip which has more functionality, you probably need to disable the limited capability of XP to prevent interactions and problems, run the following command:
regsvr32 /u %windir%system32zipfldr.dll
Want to re-enable the builtin zip capability, run the following command:
regsvr32 %windir%system32zipfldr.dll