Hi khfan22,
Thank you for posting in MSDN forum.
The error may be caused by a lot of reasons, please download a good iso image to repair your VS Professional 2015 first.
VS 2015 iso Microsoft official download link:
https://www.visualstudio.com/en-us/downloads/download-visual-studio-vs.aspx
VS 2015 iso files SHA-1 Values link:
https://www.visualstudio.com/en-us/downloads/visual-studio-2015-iso-sha1-vs.aspx
PS: To make sure whether your package is corrupted or not,
please use FCIV.exe http://support.microsoft.com/kb/841290 to verify hash of the ISO.
Tips:
http://social.msdn.microsoft.com/Forums/en/vssetup/thread/60f71a54-506e-4c70-be98-e993ce6d1ddf
If the above still doesn't help, I need you installation log file to troubleshoot this issue,
please use http://aka.ms/vscollect to gather the installation logs. After using it, you will find vslogs.cab from %temp% folder. Please upload the file to
https://onedrive.live.com/ and share the link here
Best Regards,
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