Magnifier lens size keeps getting smaller

Hello,

Thank you for choosing Microsoft forums.

I understand that you are unable to retain the size of the magnifier on the computer.

I would like to know some information about the issue so that we could assist you further.

1. What is the model number of the computer?

I would suggest you to try the following steps:

Step 1: Try to clean boot the system:

How to perform a clean boot in Windows

A clean boot is performed to start Windows by using a minimal set of drivers and startup programs. This helps eliminate software conflicts that occur when you install a program or an update or when you run a program in Windows 8.1, Windows 8, Windows 7, or Windows Vista. You may also troubleshoot or determine what conflict is causing the problem by performing a clean boot.

http://support.microsoft.com/kb/929135

Note: Refer "How to reset the computer to start normally after clean boot troubleshooting" to reset the computer to start as normal after troubleshooting.

Step 2 if the above steps does not resolve the issue try to create new user account.

Create a user account

http://windows.microsoft.com/en-us/windows/create-user-account#create-user-account=windows-7

Note: In order to copy files to the user profile you can follow the steps provided in the following Microsoft Article.

Fix a corrupted user profile

http://windows.microsoft.com/en-us/windows/fix-corrupted-user-profile#1TC=windows-7

Additional information:

Make items on the screen appear bigger (Magnifier)

http://windows.microsoft.com/en-au/windows/make-screen-items-bigger-magnifier#1TC=windows-7

Hope this information is helpful and do let us know if you need further assistance. We will be glad to help.

Thank you.

Thank you for your suggestions.  Regrettably neither path solved the issue.  The pattern of ever decreasing lens size recurred with regularity both under the clean boot mode as well as with a new and presumably clean user profile.

Hello,

You may try to Customize the Magnifier:

Hello Mr. Pond,

Thank you for keeping us updated on the status of the issue.

Please refer to suggestions from bchapman255 replied on April 2, 2010 and Samhrutha G replied on November 19, 2009 and check the issue.
http://answers.microsoft.com/en-us/windows/forum/windows_7-desktop/windows-7-magnifier-not-working-correctly/23cb5292-f5c6-47a7-9a3f-48f75612edf0

Note: 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:
http://windows.microsoft.com/en-us/windows/back-up-registry

I hope this information helps.

Thank you