Slow opening files on home computer only

Good morning,

Dropbox WAS working fine for months.  All of a sudden it takes about 1 minute to open a file in DB on my home computer only.  My work computer with DB opens great.  I've read some fixes, and I've uninstalled and reinstalled the app 3 times.  It never asks me to run as an administrator, so as per previous "fixes" I've read, I'm already running as an administrator.  I did notice when I went into security, there are three "group or user names".  One is "System".  One is my email address.  And, the 3rd one is "Administrators (my computer\Administrators).  I'm wondering if that's an issue.  If not, I have no idea what to do now.  And, since this is my home computer, and your support team is only open M-F, I would appreciate some sort of help here.