I would suspect your Display Adapter driver is not functioning correctly.
Device Manager (devmgmt.msc) can be used to 'uninstall' the driver, and
'scan for hardware changes' to refresh the driver (Action menu)
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Mark L. Ferguson
..
"AJ" <> wrote in message
news:E11B555A-E170-412C-B4BD-...
> My Vista has started to freeze for no apparent reason. It will be working
> fine, and then all of a sudden it will completely freeze, where there is
> no
> egg timer, the cursor does not move, there is no hard drive activity at
> all
> and crtl+alt+del does nothing, as the PC is not respnsive to anything. It
> seems to happen more when watching video files, either form the hard disk
> or
> streamed over the internet, but it can also happen when typing in a Word
> document with nothing else open, and so it is hard to find any pattern. I
> have to press the reset button to use the PC again. The recovery options
> display, but then there are no entries in event viewer to give any clue of
> the cause. Help would be very much appreicated.