P6 Project Link Problem

I have posted this problem before but , there was no reply
This time i am giving the problem in detail hoping to get some solution

I am using P6 on Vista (32 Bit) Laptop
And MS project 2003, (I was using MSP 2007 also , but later i uninstalled)

I was managing my MS Project Files In P5 When I Had an XP System

Here Is My Problem
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Whenever I Try To Save MS Project Fils In P6
after login entry I Gets This Message
’’Unable to write to C:\Prog.\Prima..\Projec..\PMAddin.ini

and MSP crashes

This is the cause of crash as MSP Says
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Problem signature:
Problem Event Name: APPCRASH
Application Name: WINPROJ.EXE
Application Version: 11.3.2008.1207
Application Timestamp: 47abe12f
Fault Module Name: kernel32.dll
Fault Module Version: 6.0.6001.18000
Fault Module Timestamp: 4791a76d
Exception Code: 0eedfade
Exception Offset: 000442eb
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
LCID: 1033
Brand: Office11Crash
skulcid: 1033

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And Whenever I try To Open Files from P6
After Login Entry I gets this message ’’PRM DB Access Error : No Base connection is available Operation Aborted ’’
this message window keep on coming until i close MS Project
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In MSP , In Projectink Options When I Select ’’auto link on startup’’
everything looks fine , the P6 login window comes , and accepts login name password etc ,
but after successful login the Project link tool buttons disappears , tool bar is there but no buttons ???

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I Have Reinstallaed P6 once , after a complete deletion of registry entries etc

any solution ???

regards

Hemant