System32 folder comes up after login

Try running RegClean on the workstation. You can find it by doing a search on the internet, then downloading it from a variety of sites. It sounds as if you have something in your registry attempting to launch an app requiring system32 resources.
Hope this helps. I have made it a habit to run RegClean on a regular schedule.

Run regedit on the affected machine and drill down to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion and then either Run, RunOnce, RunOnce, RunOnceEx. Look for a key with a blank value (or an invalid value).

See
https://www.techrepublic.com/forumqa/thread_detail.jhtml?src=search&thread_id=11663

(should be no spaces when you paste that url)