Could be a bit of both. I didn't have any problems downloading either the 32 bit or the 64 bit version of the RC, but I do remember having problems downloading the beta. Never had any problems burning to DVD though, or installing. I've used the same old 4x DVD+RW each time I've installed Windows 7.Its actually up to Aug 20th Loft, not sure if they had extended it again.I've partitioned the HD and giving it a go. So far though, I have wasted 5 DVD's and one that worked got to an error (which apparentely means a corrupt download/burn) so I am not sure if the Microsoft download manager is crap or my DVD's are shat.
It could be a partition or other HD error, but that's doubtful. I'm using partitions setup a while ago with Partition Magic running under XP, which eliminates disc compatability as an issue.