Unfortunately Google cache has stopped serving the MU terms of service, but this link still has them: http://www.scribd.com/doc/78876728/Megaupload-Condiciones-de... and there it says:

"No Warranty

You expressly understand and agree that: (a) your use of the Service is at your sole risk. Megaupload Services are provided on an "as is" and "as available" basis. Megaupload and its suppliers, to the fullest extent permitted by law, disclaim all warranties, including but not limited to warranties of title, fitness for a particular purpose, merchantability and non-infringement of proprietary or third party rights. Megaupload and its suppliers make no warranties about the accuracy, reliability, completeness, or timeliness of our Services, software, or content; (b) Megaupload makes no warranty that (i) the Service will meet your requirements, (ii) the service will be uninterrupted, timely, secure, or error-free,(iii) the results that may be obtained from the use of the service will be accurate or reliable, (iv) the quality of any products, services, information, or other material purchased or obtained by you through the Service will meet your expectations, and (v) any errors in the software will be corrected; ..."