Poor quality in preview - image is blurry

To date, I have not had any issues with the preview quality matching the actual image quality.
I have not made any hardware por software changes. Image files are in raw, jpg and tiff formats.
This issue appears to be only with raw files. The image in preview is extremely blurry, yet when the
file is opened it is tack sharp. I have checked all my preference settings and cannot figure out what is goin on.
I have tried purging and refreshing the cache and nothing seems to work.
I am running PS CS4
Windows Vist 64 Ultimate
Please help!
Update: I have changed raw preferences to apply to preview images only. The image qulaity only seems to improve when I
purge the cache for the slected images. I have the cache option for export to folder when possible checked. I have tried to purge the cache for
all images but the preview does not imprevoce unless I purge selected only.

This may be dumb but when it recently happened to me, I opened one image in adobe camera raw and increased the clarity by an inpercievable 1%. Then I hit done. Preview looked crisp again. I copied settings of that image. Then I highlighted all other blurry previews and pasted settings and they all became crisp again. Probabley just a quick fix that doesn't solve the problem but my knowledge is limited.
-mark

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I don't have any other ideas. It may be worth considering creating a phone case here:
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If we use the forums properly they will work well...

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pickera2
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Poor quality in preview - image is blurry

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