Internal Error 2503/2502

Win 7 Ult 64-bit:

On random installs i get the above error msg w/ 1 of the 2 codes listed..... here is what i have done:

-Checked Windows Installer, it is set to manual

-cleared out all those install files

-tried to locate the reg files used to correct this similar issue on previous versions on Wins, no luck on that


I am pretty computer literate(minor repair as a hobby, build my own machine/family machines), but since about the time wins 7 came out I have had little time to really dig into wins 7, so have been restricted to mostly a user the last 6 months or so. I have reached the extent of my knowledge on correcting this particular issue.

oh, and to add.... I tried to install and run the windows clean up utility and it gives the same error while in setup  =D


Hi Tynne,

·        What are you trying to install?

·        Did you get any error message along with the error code?

·        Did you make any changes on your computer prior to this issue?

Let’s try these steps and check if it helps.

Method 1

Unregister Windows Installer, and then reregister Windows Installer. To do this, follow these steps:
1. On the "Start" menu, click "Run.
2. In the "Open" box, type "msiexec /unreg", and then press ENTER.
3. On the "Start" menu, click "Run".
4. In the "Open" box, type "msiexec /regserver", and then press ENTER.

Method 2

Check permissions within the Installer folder. To do this, follow these steps.

1.     Click on Start and in the Start Search bar > type in > c: /windows/installer.

2.     Right click on c: /windows/installer at the top under programs and click properties.

3.     Click on the security tab > Verify if System and Administrator account has Full access permissions.

4.     The Everyone account should have read and execute permissions, List Folder Contents, and Read.

Method 3

Also run an online virus scan from the link given below as it sometimes cause due to virus. If you have any antivirus software installed on your computer please install the latest update for the software so that it works properly.

Hope the information helps. Please post back and let us know.

Debleena S
Microsoft Answers Support Engineer
Visit our Microsoft Answers Feedback Forum and let us know what you think.

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Question Info

Last updated June 4, 2021 Views 151,778 Applies to: