Sony Vaio Hanging Problem

hello Buddy I own a Sony Vaio VGN-FW21L, with the following config-OS Name Microsoft Windows Vista Home PremiumVersion 6.0.6001 Service Pack 1 Build 6001Other OS Description Not AvailableOS Manufacturer Microsoft CorporationSystem Name System Manufacturer Sony CorporationSystem Model VGN-FW21LSystem Type X86-based PCProcessor Intel(R) Core(TM)2 Duo CPU T5800 @ 2.00GHz, 2000 Mhz, 2 Core(s), 2 Logical Processor(s)BIOS Version/Date American Megatrends Inc. R1090Y0, 25/07/2008SMBIOS Version 2.4Windows Directory C:\WindowsSystem Directory C:\Windows\system32Boot Device \Device\HarddiskVolume2Locale United KingdomHardware Abstraction Layer Version = "6.0.6001.18000"User Name pradeepsaran\pradeep saranTime Zone India Standard TimeInstalled Physical Memory (RAM) 3.00 GBTotal Physical Memory 3.00 GBAvailable Physical Memory 1.54 GBTotal Virtual Memory 6.19 GBAvailable Virtual Memory 4.29 GBPage File Space 3.29 GBPage File C:\pagefile.sys.The trouble is I now right now relocated to India and When i initiated using the laptop in India, the laptop Hangs/Froze atleast once a day.I never came across this point when i was in United Kingdom and thats where i bought this laptop.I ran full computer hardware Diagonstics and it came up after 2 hurs saying each thing is working good.I even ran the full Anti-Virus scan and it had 3 virus/spam and i removed them.This isssue is literally bothering me and confused as in how to go regarding this point.

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