If your at min specs that may be the major problem but I doubt it.
I run at min specs with no problems until I create them.
It's VERY easy when modding to change a file in an install, then forget you did so.
I do it all the time, and I SHOULD know better!
Heck!
I found out I had 2 installs I forgot about!!!
And I've been running 10 installs!!!