Can I upgrade its RAM upto 2 GB

Hello,
I like to upgrade my notebook computer RAM to 2GB ,Now it has 1.256 RAM . 1GB in one slot 256 on the other . The speed is 266/200pin sodimm .Can I add 2GB by replacing 265 RAM? system configration details are given below

OS Name Microsoft Windows XP Home Edition
Version 5.1.2600 Service Pack 3 Build 2600
OS Manufacturer Microsoft Corporation
System Manufacturer Midern sag168168
System Model Intel 845E
System Type X86-based PC
Processor x86 Family 15 Model 2 Stepping 7 GenuineIntel ~2400 Mhz
BIOS Version/Date Insyde Software Corporation Version 3.02, 12/26/02
SMBIOS Version 2.2
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume1
Hardware Abstraction Layer Version = "5.1.2600.5512 (xpsp.080413-2111)"
Total Physical Memory 1,280.00 MB
Available Physical Memory 448.26 MB
Total Virtual Memory 2.00 GB
Available Virtual Memory 1.96 GB

by
PRADEEPKUMAR