hi, can someone help me, i download ad-aware free and while i was setting up the program that error message appears ,it says like that : error 1335 The cabinet file ‘Cabs.w1.cab’ required for this installation is corrupt and cannot be used. Afterthat when i ignore this error another error message appears : internal error 2350. Than installation ends because of errors. what can i do ? is there any solution?
This sounds like a corrupted download.
Try downloading the file again. 
Welcome to the forum.
A google search for ‘cabs.w1.cab’ returns many hits for other applications and mostly they also suggest downloading again.
From Lavasoft forums, http://www.lavasoftsupport.com/lofiversion/index.php/t8636.html
http://www.lavasoftsupport.com/lofiversion/index.php/t8409.html.
If you were trying to download and install in one go, perhaps it would be best to download and save to your desktop or another location and execute from there. Perhaps trying to download from a different location.