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Laptop cannot connect to Internet - Combofix nearly fixed it, but not quite

Posted on 2013-06-02
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Last Modified: 2013-12-06
My next door neighbour asked me to look at his son's Toshiba laptop which couldn't connect to the Internet and was taking forever to run anything.

It's running Windows 7 Home Premium.

This happened 12 months ago, Then I ran Combofix and Malwarebytes, then installed MSE and everything was fine.

This time Combofix found and deleted a couple of files in safe mode. Back in normal mode it loaded all it's programs, then after a minute it was back as it was.

I have tried running a Malwarebytes scan in normal and safe mode, but it stops responding after five minutes and the task manager reports 0% CPU usuage.

Any ideas - I'm stuck at the moment?
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Question by:carolinems
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Expert Comment

by:aadih
ID: 39214373
Try a root-kit scanner, e.g., TDSSKiller:

http://www.bleepingcomputer.com/download/tdsskiller/ >
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LVL 30

Expert Comment

by:ded9
ID: 39214670
Boot computer in safe mode with networking and check whether you can browse internet.

If yes then do a clean boot ...would also recommend a new user account ..old profile might corrupted by virus.

Clean boot process

Start-type - msconfig- click on startup tab- click disable all...then click services tab- put a check on hide all microsoft services ...and then click disable all....click ok and then restart the computer in normal mode.

If everything works fine in clean boot then enable five startup items and services at a time to find the faulty software.




Ded9
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Author Comment

by:carolinems
ID: 39214852
TDSKiller didn't find anything.

Had to run this in SAFE mode as programs will not run in NORMAL mode.

Disabled everything in MSCONFIG and restarted.

I will restart 5 at a time as you suggest tomorrow.

Many thanks.
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If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 24

Expert Comment

by:aadih
ID: 39214864
Try:

Scanning from a rescue disk (e.g., Kaspersky Rescue Disk 10):

http://support.kaspersky.com/us/viruses/rescuedisk >

Or any other.
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Accepted Solution

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ded9 earned 500 total points
ID: 39215010
After disabling everything in msconfig...reboot ...check whether internet works....if it works only then start enabling 5 start-up and services entry at a time.


Ded9
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Author Closing Comment

by:carolinems
ID: 39215502
All done. Someone had put McAfee on, which must have annoyed MSE. Once removed everything was fine.
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