Here is the capx copied straight from my laptop.
(As a test i copied the capx to my desktop pc and instantly the Every X Second condition works like a charm)
Same Capx, just different computer, so my gues is that on your pc it also works like it should.
I also reinstalled Construct2 "latest stable release" on my laptop but the issue remains.
Strange this is.
If u cant find anything in the .capx then i could also upload a short movie to show it.
My laptop is the Acer aspire 5520
I hope u can find something.
Thanx for looking in to it Ashley