Download of a song was corrupted, what do I do

I have been purchasing some music from the iTunes store today using iTunes on my Windows 7 PC. Two of the songs have not downloaded. An error message appeared to say that the file was corrupted, when I check the list of songs purchased I see next to the title of the songs concerned...

zero KB of 1.0 KB - stopped (err = -100000)

I have done as advised and clicked Store and Check for available Downloads and nothing happens. Will I eventually be able to download these songs when Apple has sorted the problem as I have paid for them already :-(