error in ISP ???

Guys, I need your help, I have made an ISP programmer for programming AT89S52 with the help from Asim khan's website. But when I WRITE a program , the software gives me the following error :
Program Verify Error @Address 0000
Data Read = 00
Prog Data = C2

So I simply can't understand this error. On the other hand, the software is able to read data from the microcontroller but as I have said already I am not able to write data into it???

PLEASE help me in sorting out this problem....

THANK YOU

Check whether, the MOSI and MISO pins might be reversed. Secondly see whether the Reset cap is leaky.
the EA*pin is expected to be connected to Vdd
you are expected to use Fig2 of link below

**broken link removed**

Inside the Fig2, there is a note indicating that at DB25 connector pins2 and 12 must be looped. A crystal is to be used instead of 3 pin resonator and with 22pF cap grounded from each pin of the crystal.

connect the body of the DB25 to the ground of the programmer.

build this one
**broken link removed**
it works with a serial port and is more reliable