Fullscreen freezed in emulators

G

I’m using three emulators:
Emulated Turbo C++ IDE 3.0
DOSBox 0.74
FCE Ultra 0.98.10
The three emulators work just fine, but when I press Alt+Enter n go full screen, all the three emulators just freeze and I’m not able to do anything, but as soon as I press Alt+Enter again they all work just fine.

What is the problem with these programs….??? Please Help..!

My system: :))

Dell XPS 15
System Model Dell System XPS L502X
System Type x64-based PC
Processor Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz, 2001 Mhz, 4 Core(s), 8 Logical Processor(s)
Installed Physical Memory (RAM) 6.00 GB
Display:
Adapter Description NVIDIA GeForce GT 525M
Adapter RAM 1.00 GB (1,073,741,824 bytes)
Driver Version 8.17.12.7533
Adapter Description Intel(R) HD Graphics Family
Adapter RAM (1,320,067,072) bytes
Driver Version 8.15.10.2253

For DOSBox have a look at this-

Dosbox.conf - DOSBoxWiki

Disable HT & try running them in compatibility mode

G

Ok, i understand compatibality mode but how do i disable HT?

^^ from bios setting and you can also try running those apps on a single core of the cpu by setting CPU Affinity - here's a guide ;-)