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#11
thanks for the direct link seavixen32 and yep I tried the latest (non BETA) driver, i.e: 285.62-desktop-win7-winvista-64bit-english-whql.exe. That didn't work, so I removed and installed historical drivers going back to the driver that originally worked i.e: 257.21_desktop_win7_winvista_64bit_english_whql.exe.
I disconnected my Winfast Video Capture from Power Supply, re-inserted the GTX 470 card in a different slot, and it has booted up ok (slower than normal) but did not hang on "Starting Windows". Now even the Nvidia Control Panel opens. It's been 1 day and all seems well now.
(thanks also NoelDP but as per #8 post I reinstalled Win7).
By the way, this forum is the best, people are friendly and willing to provide advice! Thanks all :)