Hi agk7,
What build of SDv5 did you install?
The 5.0.0.174 is an improvement in speed as compared to previous versions of SD. On my computer it causes a minor slow down, which is almost unnoticeable.
I don't think the problem you are having is related to SD, because you uninstalled SD already. An uninstall should not affect anything related to logging in. If you installed SD and rebooted and had problems after then it may be related. What else did you do to the machine before shutting down? did you install any other apps? make any drastic changes?
You may need to do a system restore to a previous date.
c_edge