I was having this same problem and thought I might be able to help. Click on this link, it should bring you up to a regular download.
**EDIT** I see what is happening, as it did with your link as well loathe, the forum is automatically parsing the link, so when one clicks on it, it brings that person up to the wowow.microsoft.com/windows/windows-7 site. (had to put the o's in between the w's or else it would think it was a hyperspace link again. )
So using that same principle, copy and paste one of these, depending if you have an x64 or x86 machine into the address bar at the top of your internet explorer beekers. Or you could even type it out. But leave out the "o" in the hottp, in Other words take out the "o" where the arrow is. And of course the arrow, making the http:// intact. I hope this helps.
Windows 7 RC x64
h-->ottp://wb.dlservice.microsoft.com/dl/download/release/windows7/e/b/5/eb58e76e-17fa-409b-855f-11fbe84d1c93/7100.0.090421-1700_x64fre_client_en-us_retail_ultimate-grc1culxfrer_en_dvd.iso
Windows 7 RC x86
h-->ottp://wb.dlservice.microsoft.com/dl/download/release/windows7/4/0/c/40c1e714-7910-4b38-9b5e-67fa522e6a44/7100.0.090421-1700_x86fre_client_en-us_retail_ultimate-grc1culfrer_en_dvd.iso