have installed both wireless and Lan modems so how
You mean you have installed the Wlan and LAN driver.
That’s ok but the notebook has been equipped also with modem (NOT WLan or LAN card)
Check the page again and install also modem driver!
By the way: this is the Win XP driver installation order:
Microsoft Updates
Sun Java Runtime Environment
Chipset Driver
Common Modules
Display Driver
Sound Driver
Touch pad Driver
Dual Pointing Device Utility
Modem Driver
Network Driver
Wireless Network Driver
Intel Client Utility
Atheros Client Utility
Bluetooth Stack
Bluetooth Monitor
Wireless Key Logon
SD Secure Module
HDD Protection
SD Memory Card Format
SD Memory Boot Utility
Hotkey for Display Devices
Display Device Change Utility
Zooming Utility
Power Management
Mobile Extension
Utilities
Password Utility
Wireless Hotkey Utility
ConfigFree
Management Console
PC Diagnostic Tool
Mic Effect
Assist
Security Assist
Button Controls
WinDVD Creator
DVD Player
CD/DVD Drive Acoustic Silencer
RecordNow
DVD-RAM Driver Software
DLA
Trusted Platform Module
Fingerprint Utility