Well, as now, there is around 400 million computer infected with the virus DNS changer... now, internet browser is redirected randomly at various time to other site... but the 7 March 2012, FBI will shutdown the fake DNS server that they have setup in 2011 when they have arrest the hacker, result will be that people who are infected will not be able to surf the internet at all after the 7 March 2012...
For test if you are infected, go to http://www.dns-ok.be/ ... if you have a big green "V", everything is ok... if you have a big red "X", it mean that you are infected... in case of infection, there is info and link for removal tool... sorry, it is in French of Dutch... more detail at http://www.dns-ok.be/dnschanger_fr.html ...
Well, you have maybe not these virus but your symptom are very similar...
If is always useful to have something like SARDU ( sardana antivirus rescue disk utility ) near you... for SARDU, go to http://www.techmixer.com/multiple-antivirus-bootable-rescue-cd-utility-shardana-antivirus-rescue-disc-utility/ or for SARDU2, go to http://www.techmixer.com/sardu-2-create-multiple-antivirus-utility-rescue-disk-usb/ ...
With SARDU2, you have :
- Antivirus Rescue Disk: Avira AntiVir Rescue System, BitDefender antivirus Rescue CD, Dr.Web Live CD, PC Tool AOSS, AVG Rescue CD, F-Secure Antivirus Rescue, GDATA Rescue CD, Kaspersky ‘Kav Rescue CD’ and Panda Safe Cd.
- Utility: Floppy win98SE, Gparted, NT password Recovery, Parted Magic, Ophcrack, Redo Backup Live, Trinity Rescue CD, System Rescue CD, Ultimate Boot CD and CloneZilla.
- Linux: Austrumi, Damn Small Linux, LiMP, Puppy Linux, xPUD, ubuntu, kbuntu and Slax.
- Windows PE: LiveXP, MegalabCD, WindowsPE, UBCD4WIN, and VistaPE.
A other good one is Trinity ( http://www.techmixer.com/repair-and-rescue-windows-os-using-trinity-rescue-kit-live-cd/ ) :
"Inside the live CD. you can see a lot of tools like resetting password tool that allow user restore and clear the password of windows and Linux operating system which user can set the password as they want on next OS login. Meanwhile, a tools to remove viruses which it equipped with 4 different virus scan products (ClamAV, AVG, F-Prot, BitDefender) integrated in a single uniform command line with online update capability.
Plus more, it can simple allocated all local files system with a simple script entry and then clones an NTFS partition to another PC over a network, a mass undeleter that tries to recover every deleted file on the drive. In addition, Trinity Rescue Kit (TRK) Live CD also provides for recovering data off a formatted or dying disk, two tools for fixing master boot record repair programs, and hardware diagnostics.
This Trinity Rescue Kit live CD can be bootable within three method like burn into ISO files, USB stick installable or network over PXE.
The best part of this Trinity Rescue Kit live CD can use on all windows and Linux to for repair and rescue purpose."
As you can see, the recent trend in rescue boot CD/DVD/USB is to be Windows/Linux compatible... beware that these linux/windows version are minimal with only diagnostic/repair tool... similar CD/DVD/USB exist for other task like by example diagnose and test a network for security... personaly, i think that they are a must have for any owner of computer... don't wait until you cannot boot anymore for think about these tools...