Hi
All
problem logging in windows because of virus of spy wares, just do the following to remove all virus and spyware from your machine.
Case -1 System very slow because of virus and malwares.
In an uninfected system open the following link
http://www.sophos.com/support/disinfection/pedis.html

Click on the emergency copy of sav32cli marked in red as shown in the above image.
Save in a new folder and name the folder as sav32.
You have a zip file with the name sav32cli in a sav32 folder. Extract all files in that particular folder.
Now on the same page click the relevant ides marked in red as shown in the figure below.

Download the latest ides in sav32 folder and extract in that folder.
Burn the entire folder on a disk.
In the infected computer boot your system in safe mode with command prompt and insert the disk.
Lets consider G drive as your dvd drive
In the command prompt
c:\g:
g:\cd sav32<enter>
g:\sav32\<capslockon>SAV32CLI<SPACE>-REMOVE<SPACE> -P=C:\LOGFILE.TXT<ENTER>
This command starts examinig each and every file in the system and removes all virus. As this antivirus detects a virus or malware press A key.
Sit back and enjoy.
Case - 2 In case your system hangs at startup and cannot enter safe mode. Boot your system with a dos bootable pen drive or floppy and perform the same steps.