Always mention ur PC Suite Version and what OS ur using with what mode ur using to connect with ur pc(USB Cable, Bluetooth)
Solution for the problem:
First get the file "PC Suite Cleaner" from Nokia WebSite
http://www.nokia.co.in/nokia/0,8764,87111,00.html#.Next go to Add/Remove programs from Control Panel and remove Nokia PC Suite. After uninstalling Nokia PC Suite, if u found Nokia Cable Driver or Nokia Connectivity Solution also remove the same. Now run PC Suite Cleaner and select from combo bar "Clean my computer", that will wipe of reg. frm ur pc.
Now install a fresh PC Suite (Latest from Nokia WebSite) and connect ur Mobile with USB, and u will find ur mobile has been connected (Wait 4 some time till the drivers get installed automatically) to PC Suite.
A advice (Which worked for me). Use the USB cable of ur mobile in a single USB port, and use the same USB port whenever u use to connect ur mobile. Preferable, don't use any other device with that USB port.
I'm enjoying with PC Suite now with this and defused the problem.
Try it. If u still have problems i'll get the solution for u.
SM Rajashekar
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Be a hero. Always say, “I have no fear.” Tell this to everyone—“Have no fear.” - Swami VIVEKANANDA