Installer service keeps shutting down

I've looked everywhere for an answer to this but to no avail.

Basically the windows installer service keeps shutting down for no apparent reason. It's set to automatically start up, and does so, but whenever I try to install or uninstall software I get a message telling the the service cannot be found so I check it and the thing has shut down. I restart the service, install or uninstall and all is well. Then, if I need to do it again, the service has shut down again.

This is particularly problematic when it comes to installing windows updates.

Why could this be happening and how do I stop it?
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Hi, I had a similar problem before and I resolved it by following the steps in the following link from microsoft.

You should also try to reinstall the latest service pack for your operating system - e.g SP4 for Windows 2000 and SP2 for Windows XP. This normally resolves any weird issues such as the one you are having.

Hope this helps.

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Windows 2000

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