Windows 7 won't launch. Startup Repair not working.

Hi all,

I'm having trouble with my Packard Bell EasyNote TJ65. On launch I get a Windows Error Recovery message telling me that "Windows failed to start. A recent hardware or software change might be the cause."
I'm then offered the choice of 'Startup Repair' or 'start Windows normally'.

Start normally - just brings me back to the same error message screen.
Startup repair - launches to Windows splash screen with a cursor, but doesn't advance from there.

Ive tried booting/reinstalling from disc, but that isn't working either. I get to the Install Windows screen, input language/location options, click on Install Now - but it then goes to a 'Setup is starting' screen and can't advance any further ... The cursor just spins (for hours!).

Any help appreciated!
THANKS