Yeah its very weird, did you guys scanned your machines to be sure its not an infection? Never knows, other thing is, disable the page file, before doing it take note of how the settings are before changing anything.
The following instructions where taken from here and i modified to the settings we needed here. (Note, on Windows 10 is the same thing.)
Change the size of virtual memory
Windows 7 More
If you receive warnings that your virtual memory is low, youāll need to increase the minimum size of your paging file. Windows sets the initial minimum size of the paging file equal to the amount of random access memory (RAM) installed on your computer, and the maximum size equal to three times the amount of RAM installed on your computer. If you see warnings at these recommended levels, then increase the minimum and maximum sizes.
Open System by Windows Key + Pause Break (note that some laptops require you to hold the FN key also)
In the left pane, click Advanced system settings. Administrator permission required If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
On the Advanced tab, under Performance, click Settings.
Click the Advanced tab, and then, under Virtual memory, click Change.
Clear the Automatically manage paging file size for all drives check box.
Click No page file, then click OK and restart.
After restarting try to open the game and see if it work.