Uninstall Programs Manually

Just because Windows XP has the Add/Remove Programs feature it doesn't mean your application will appear in the list. Furthermore, even if it does appear, it's no guarantee that the uninstall feature will work. When you run across one of these situations the items listed below will help in getting rid of the application. Be aware that these steps may not remove everything associated with the application and can impact other applications on the computer. Have a backup or restore point and use caution.

Find the directory for the application and delete all the files in the directory. Delete the directory.

Open regedit and navigate to HKEY_LOCAL_MACHINESOFTWARE and find the folder for the application. Delete the folder.

Open regedit and navigate to HKEY_CURRENT_USERSOFTWARE and find the folder for the application. Delete the folder.

To remove the application entry from Add/Remove Programs (if present) open regedit and navigate to HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstall and find the folder for the application. Delete the folder.

Some applications have Services attached to them. If this is the case, navigate to HKEY_LOCAL_MACHINESystemCurrentControlSetServices, locate and delete the service.

In Windows Explorer, navigate to the individual user settings and delete program references. Common places to check would be:

C:Documents and SettingsAll UsersStart MenuPrograms and delete relevant entries.

C:Documents and SettingsAll UsersStart MenuProgramsStartup and delete relevant entries.

C:Documents and Settings%YourUserID%Start MenuPrograms and delete relevant entries.

Do this for each User ID listed

C:Documents and Settings%YourUserID%Start MenuProgramsStartup and delete relevant entries.

Do this for each User ID listed

If no entries were found in the previous step and the application launches automatically, navigate to

HKEY_CURRENT_USERSoftwareMicrosoftWindows NTCurrentVersionWindows

and delete the entry.

source:here