If you computer is been infected by Trojan:Win32/Lecpetex.B, I think it will be awful for sure. With this Trojan:Win32/Lecpetex.B in your computer, you will find that your computer gradually turn slow and unstable. Sometime, it takes minutes waiting for responsible to open an original program in your computer. Also, sometimes, your computer can be frozen suddenly for no reason.
This Trojan horse is a new malicious creation by cyber criminal. It can do a bunch of vicious activities behind your computer
Anyway, I suggest you to get rid of Trojan:Win32/Lecpetex.B from your computer as soon as possible, or it will crash your computer sooner or later.