Is it safe to connect a PC with unknown history to my router?

Posted on 2006-05-28
Last Modified: 2013-12-04
I may need to connect a third-party PC to the internet for updates etc.  I have no idea what is on the machine - for all I know it may be (and probably is) riddled with viruses, spyware and other rubbish.
- Is it safe to connect to the internet with this machine to my router whilst other machines are connected?  Or, if not...
- Is there anything I can do to protect the other machines that are also connected to the router?
- Is it possible that the third-party machine could contain something horrible (virus etc) that could potentially upset my router's functionality?

Question by:Sigh_Man
    LVL 97

    Accepted Solution

    Greetings, Sigh_Man !

    If the PC virus and spyware status is unknown, do not connect it up to your network. You can unhook the other PC from router and connect this one.  Run your antivirus and antispyware programs to make sure this computer is clean. If you do not know what antivirus program to run, run one of these

    Housecall Online Scan
    Panda Activescan
    Kaspersky Virus Scan

    If you do not know which antispyware to run, run both Spy Sweeper and Ewido

    Spy Sweeper

    Best wishes!
    LVL 95

    Assisted Solution

    by:Lee W, MVP
    Anything is possible... but is it LIKELY.

    First thing you should do is power it on WITHOUT it connected to the network and get some ideas about how infected in MAY be.  Then run antivirus software, antispyware software and other such programs.

    THEN, I'd make sure your clients are all up-to-date on these programs.

    Then decide what you'll do next based on what you find.  (And if you need to download programs and such, do it and burn them to CD so they can't transfer infections).
    LVL 23

    Assisted Solution

    Is this a permanent connection?
    If not, just disconnect other pc's when you connect this one...
    If it is a permanent connection:
    Delete all temp. files (%temp%)
    Delete all temp. int. files
    Delete all cookies.
    Disable system restore (controlpanel - system - system restore)
    Run Ewido (update it first)
    Run av software (Bitdefender is the best rated : )
    Run Hijackthis:
    Analyse the scan log here:
    Once the log is clean you should be okay.

    The short answer to the question in your title is:

    LVL 23

    Expert Comment

    don't forget to re-enable system restore if you use it.

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