If you are installing from the blue disc, you shouldn't have any problems.
But remember to right-click the install program and "Run As Administrator".
If you are installing from an older Black and White disc, there are a few extra steps to follow.
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Re: PBP and IDE/programmer
sounds like you have over written the osccal/ value stored at the top of memory for 12f508.
richard Today, 10:39Most programmers will not reprog that chip when the value is missing.
The old pickit2 can reset a value...