Sounds like a programming cable problem.

If you have nothing connected to the programmer, and try to read back a 12F675, it'll show these configs.

Code:
Oscillator      LP
Watchdog timer  Disabled
Powerup timer   Enabled
MCLR Pin        Input Pin
Brown out       Disabled
Code protect    Protected
Data EEPROM     Protected
And it'll show all 0000's in the code window.

Check the connections again, especially at the 10-pin connector on the programmer.
Make sure the connector is alligned correctly.
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