10.7.3 - tried three times always corrupt

[glengoyne17]

Tried updating three times, twice via menu once via safari manual download.

Every time on reboot it says it can't continue, checksum mismatch. Is this normal or could it be my network card or low free space on ssd?

now trying download in windows and then fouth try

 

[glengoyne17]

Worked after manually downloading in windows....weird.