Hi Forum Members,
After Burning a lot candles for overnight study, ultimately I got the solution to the problem. And the Solution is:

Problem Area:
The statement MSComm1.ReplaceParity="" was placed in the code where the serial port is initialized.

The reason why it was used:
The instrument was sending the Data with "9600,O,8,1" but it is giving parity error for every byte that is recieved. Hence to disable this parity error I used the Above command in the code.

Problem:
This command works properly with Windows98, but for Windows XP it forcibly replaces the charachter (having Parity Error) with &h27. This is the code for chr(&h27) = "'".

Solution:
1.I had to comment out this statement for applications that use WindowsXP, and enable it for Windows9x.
2.There is another way that works and that is for the MSComm object , right click->Properties and delete the charachter for ParityReplace. This also works fine.

So like many other problems created by Microsoft (due to upgrade in MSComm32.OCX), we have a solution.

Bye,
Mr. Kiran V Sutar
Mumbai, INDIA