winxp error load needed dlls for kernel

Problem began after attempting to install winxp sp3. Using HP Presario with AMD processor and xp home media. Do not have the install cd just a recovery partition on D: drive. Did also make a set of recovery cd's when I first purchased the computer. If of any value I do have install cd for WinXP Prof.

Contacted Microsoft SP3 Support. Helped uninstall service pack with following command in c:\windows directory $NtServicePackUninstall$

Seemed to uninstall service pack yet still receiving the same error code Load Needed Dlls for Kernel.

Is there any other procedure to repair operation syst without performing a complete recovery???