What does System not modified mean on PC

Could somebody please try and help me.
I have an application which I installed successfully on Windows 8.
For some reason or another I un-installed the application.
When I went to re-install the application it told me the following.

Your system needs to be modified.
What are they talking about.

2 answers Last reply
More about what system modified
  1. Have you rebooted your computer?
    Did you install it from the Windows 8 App Store?
  2. it sounds like Windows 8 ws installing WIndows updates in the background and you need to reboot for them to complete...thus the "needs to be modified"
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