Focusrite Saffire LE click problem

I have a Focusrite Saffire LE click problem

almost every 10 seconds I heard a click while i´m playing a music file, any type. It´s only when i´m playing it. I checked recording something an doesn´t happened but when i played the file i recorded, there are clicks…

should be for some software incompatibility i guess…

I have a Laptop Toshiba Tecra A4 with 1.5 GB Ram 60 GB HD 4200 rpm

I have many programs installed…

vegas video, sound forge, wavelab, nuendo, adobe premiere, adobe photoshop, etc

the other thing is that I can´t make the Saffire be recognised by Nuendo…

I tried to contact Focusrite but they said they have the support email close because of a lot of spam, very disapointing

if anyone can help…

Thanks