Removing Virus from System Files

How do you remove if your Windows systems file is infected with virus?
Can you delete them without jeopardizing your system?
faysal_ahmedAsked:
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hunartCommented:
Please provide more details about your system.  Also, what type of virus do you have.  Can you system boot in Windows normally?
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TonypeswaniCommented:
Please provide more details about your system.  Also, what type of virus do you have.  Can you system boot in Windows normally?
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pchelpandcareCommented:
You can try using the following tool:
http://www.avg.com/us-en/avg-rescue-cd

Burn a CD and start your PC from it. System files will not get locked and you will be able to scan them for viruses. If they are infected and can't be healed, they might end up being removed or you will have to leave them untouched, so leaving the system infected.
This will depend on the virus that you're dealing with.
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wuyinzhiCommented:
first of all, you should know type of malware it is. some worms modify windows registry and to get rid of it, you should remove the worm from memory first (with tools like process explorer or antivirus) then clean the registry with registry cleaner (eg. CCleaner).

But if it's a virus that infecting executable file, it's important to detect what the name of virus (you can upload the infected file to virustotal.com to get its name), then find some special removal of virus to heal infected files, because some antivirus just delete the infected file.
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Miguel Angel Perez MuñozCommented:
All system files are protected by digital signature in Windows XP. Try running this command: "sfc /scannow"
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willcompCommented:
Without details, here are some general instructions.

If you know which system files are infected, the best method is to boot from a UBCD4Win disk, delete the affected files, and then replace with clean copies from another PC with the same OS and SP. You may also be able to replace the files from an XP CD using Recovery Console for XP systems.

I assume that your AV software is not able to clean the affected files.
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hunartCommented:
Cleaning or removing virus or spyware programs are specific to each one.  Like everyone is saying, we need to know the particular of the viruses/spywares before we could assist you further.
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faysal_ahmedAuthor Commented:
It was Xp pro Windows OS, Dell Laptop,  I was doing a boot scan with Avast and a message popped up saying the system files are infected. I wasn’t quite sure what to do so l left as it is without healing the system files.  
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pchelpandcareCommented:
The only way is to try and heal them. If you want they will just keep spreading as you use the system.

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faysal_ahmedAuthor Commented:
I also have another question in relation to virus, a colleague of mine has a laptop (stand-alone) with Vista OS installed.  He seems to be getting a ‘Windows home security virus’ that pops up every 10 mins asking him to register and purchase, how does he remove this, his current anti-virus is not working.

Many thanks.
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willcompCommented:
Please ask a separate question regarding "Windows Home Security" fraudware.
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pchelpandcareCommented:
Go to Control Panel -> Programs and Features -> Uninstall program and try searching for Windows Home Security or something similar and removing it from there. If the current anti virus is not working, either remove it and replace it with new one, or update it.
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faysal_ahmedAuthor Commented:
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