Gimp 2.8.16

Hello dear people of portableapps.com

please don't be mad at me for this question because I seriously need help, because I am not able to find the bug in my program, I also don't really know when it stopped working however here is the issue!

Gimp 2.8.16 just stopped recognizing .jpg and .png and so on and I don't know what went wrong

So I googled the issue and the given solution there was to install an older version of gimp portable however this also had the same issue.

I updated lately from Windows 7 32bit to Windows 7 64bit is this the problem?

I need the portable programs to work for school if this is the only issue I can live with it because the laptops at school are 32bits.

But it would be nice to find out an solution together!

Thank you for helping me in advance!