Its fixed now =)...
I just installed WIndows Installer 3, and Activsync 4.5.
Now it works fine..
Thanks you all
(ps: The error was comming after i re-installed my machine. therfore, i had flashed lots of roms,).. And it was an old computer, now i got my desktop pc back, which it way better, ( XP-pro, SP2)
(Can be Closed)