I'm trying not to complain too much, but some times you have to. Today I decided to upgrade my main machine to Windows 7 Release Candidate, while working on the laptop. The first attempt failed due to lack of disc space - it's needs 10Gb free - but I soon solved that. Then I left the upgrade to trundle away until the final stage of transferring files, settings and programs, whien 43% of the way through (ooh, so close), I received the annoying statement that there wasn't enough disc space free and it would revert to the previous version. So,...