Is the font display of Windows 7 slides messy? Is it a virus?

Is the font display of Windows 7 slides messy? Is it a virus?

This problem has been solved for several days. The pptfile created by other people's PowerPoint2010 is sent to the problematic computer (PowerPoint2007) and it is completely different, as shown below.

The normal file display is as follows:

At first, I thought it was a software problem. I re-installed version 2007, but the problem persists. Later I re-installed version 2010, but it showed abnormal.

It does not seem to be a problem with the software version. The most likely problem is the system's font. Then we downloaded the font and installed it. Some of them have been displayed normally several times, but they are not completely normal, it will be abnormal. I copied the font from other Windows 7 systems, but I still cannot.

Patch the system and scan the system with 360. the problem persists.

Finally, there is no better way. After the image is restored to the system, the installation of the office software is normal.