Windows Installer and Error Codes 641 & 80070641 Issues
something has happened to the windows installer on my computer. I have vista home premium 32 bit. I tried searching your site to download the installer but I could not find anything. I tried installing Java and it said it couldnt because the windows installer
could not be accessed. and I have been trying to install some windows updates and keep getting error message codes 640 & 80070641. everything was working up until a few days ago when I tried updating nothing has been downloaded to my computer prior to errors.
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In addition to Ravinath P suggestion dated on May 21, 2012, you may also follow the steps mentioned below and check if it helps.
I suggest you to perform the following steps to rebuild the windows installer service.
Note: To do so: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these
steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article
in the Microsoft Knowledge Base: