We see that you have Adobe Acrobat DC registered in your account. And as mentioned above that you can't convert the files to pdf, so is there any error that you are getting during conversion?
Using Adobe Acrobat DC, here are the steps that you can follow for the conversion-
If you are trying to access the service online https://cloud.acrobat.com/exportpdf then you may check with a different web browser. Or you may turn the internet security software off for a while (If any) and check.
[Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install or activate other software, you should re-enable it as soon as you're done.]