My downloads are acting strange

i was downloading CSI and Touch master, and my internet was going slow ( wireless linkyses ) so i pulled it out and put an ethernet cable in, this went even slower so i put my wireless back in. now i tried to re-download these games and it does it in about 10 secs, i try to unzip the folder and it says it has corrupted, ive tried 4 different games and it keeps doing it? help will be much appreciated :DEDIT: I just downloaded neves and it worked, now it just wont download CSI or Touchmaster :(

Delete the failed downloads and try again. You may also have to try downloading with a different browser if that doesn't work.