1. Which program are you trying to install?
2. Is it compatible with windows 7?
3. Did you check the minimum system requirements for that program?
Let’s try un-registering and re-registering mscomctl.ocx file and then, check for the issue.
a. Click on the "Start" menu, click on All programs, click on Accessories.
b. Right-click on "Command Prompt" and select "Run as administrator" from the menu. After acknowledging the User Account Control warning, type the following commands (one at a time):
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