i,m new please help: can't launch it due to security reasons
 

i've just downloaded LW and managed to download what i want but i don't know how to open it. please help it just tells me i can't launch it due to security reasons

See "for security reasons"? (click on blue link)

thank you but now it's telling me that the file is corrpt will i need to download it again

You could try .. but if it's a program you downloaded, chances are the original was corrupt. Best to choose the largest of those you find. Since many original programs come on CD's etc. so ...
Also, though it might not be listed, you could always try bitzi lookup to see if there's been reports about that particular file.