I apologize that I did not get you on chat. However, I can assist you further in Question and Answer mode.
The Windows 7 / Vista System Restore feature will make sure that software installations, drivers, and other updates can be rolled back. The only price to this feature is some disk usage. And here, this caused the C drive to full. Please try disabling it by foillowing the instructions below and check if the issue persists.
Click Windows Start button, and from the Start menu, right-click on the Computer
icon, and choose Properties:
Click on the System Protection link on the left-hand side:
Once you’ve done so, the steps are different depending on your OS.
Disable on Windows 7
Click the Configure button below the list of drives:
Now simply click the radio button to disable System Protection. (Note again that this is probably a bad idea).
That should be all you need to do. Then, check the C drive space.
I would suggest you do the following too, if the issue persists.
Go to the link given below, download and install Ccleaner.
Install it and run it. After launching, click Analyze and then, run cleaner. After that, click Registry from the left pane of Ccleaner. Then, Scan for issues and Fix selected issues. There is no need to backup the registry.
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