Uhh, suhasmk, your computer is a malware farm.

Tick, then fix these:
C:\WINDOWS\system32\SSVICHOSST.exe
C:\WINDOWS\system32\SSVICHOSST.exe
(yes, there are two of this)R3 - URLSearchHook: (no name) - {12F02779-6D88-4958-8AD3-83C12D86ADC7} - (no file)
F2 - REG:system.ini: Shell=Explorer.exe SSVICHOSST.exe
F3 - REG:win.ini: load=
F3 - REG:win.ini: run=
O1 - Hosts: 203.27.235.25 www. payseal.icicibank.com
O1 - Hosts: 210.210.19.82 www. sifymall.com
O2 - BHO: Windows Live Toolbar Helper - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - (no file)
O3 - Toolbar: Windows Live Toolbar - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - (no file)
O4 - HKCU\..\Run: [Yahoo Messengger] C:\WINDOWS\system32\SSVICHOSST.exe
O4 - HKLM\..\Policies\Explorer\Run: [status] present
O4 - HKUS\S-1-5-18\..\RunOnce: [yisouu.dll] Regsvr32.exe /s C:\PROGRA~1\YiSou\yisouu.dll (User 'SYSTEM')
O7 - HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System, DisableRegedit=1
O17 - HKLM\System\CCS\Services\Tcpip\..\{48A41D8E-AED2-41C8-B82F-B28467017BBC}: NameServer = 202.144.95.4,202.144.66.6
O18 - Protocol: ebk - {1E411CE8-FE8B-4973-B8E0-6EA2CC3C6B06} - C:\WINDOWS\system32\ebkp.dll
Also run a full scan in safe mode with disabled system restore.