Windows+install+service+could+not+be+accessed

If your computer as taken it’s bat home and will not allow you to Update or New Install, in all probability you have a corrupted or damaged installer service file or files.
 * Windows install service could not be accessed **

There is a possible solution without having to rebuild/reinstall XP. However, you must implement my tip “ Procedures before editing the Registry “. **__ This is not a suggestion it is a must __****__. __**

The other obligation you must be logged in as Administrator

Go To :- In the box type without the quotes “ **CMD** “ **Enter/OK** This will display the DOS screen. After the Chevron type without the quotes **“Msiexec.exe/unregister** “, and then press **Enter.**
 * Start > Run **

What this does is un-register the computer and now you have to re-register it

Now type without the quotes “ **Msiexec/regserver** “ and press **Enter**

The next step is to give the **SYSTEM** account full control permissions to the registry hive **HKEY_CLASSES_ROOT**. ( This is why it is a pre requisite to implement my tip quoted at the beginning of this tip.)

Go To :- In the box type without the quotes **“ Regedit “ Enter/OK** Click **Edit/ Permissions** In the Group or User Names list, check to see whether SYSTEM is listed. If not, click Add.
 * Start > Run **
 * Scroll to :- **
 * HKEY_CLASSES_ROOT **

Contn:-

Ensure that the "**From this location**" box shows the local computer name. Type **System** in the "Enter the object names to select" field, click **"Check Names**," then click **OK**. In the "Group or User Names" list, click **SYSTEM**. Tick/Check the **Full Control** check box under **Allow**. Click **Appl**y, then **OK**.

Now reboot.

My commiserations if it does not work, you now face hours of work rebuilding.