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You can use 'Safe mode with networking' (press F8 when computer start few times in 1 second interval, and menu with this option will come). Going to ESET (Nod32) Online Scanner: http://go.eset.com/us/online-scanner
Scan computer with recover-cleaning option on. Some viruses are hard to clean, and one of option is using live CD linux (Mint) and share partitions, and than connect with network cable and clean with antivirus from another computer.
You have free good AVG antivirus (for home users).
Windows without antivirus is very bad thing.
For that purpose, I use linux Mint (based Ubuntu and Debian). And don't need antivirus software. Good luck!
you may have spyware in addition to a virus, if any. download malwarebytes from www.malwarebytes.org and after installing it, update it to the most recent database and scan your computer. Secondly, click start, and from the run line type msconfig and enter. Click the startup tab, and uncheck any programs that you don't want to start automatically every time you turn your computer on (they will still be installed).
If the error cannot be removed safely is coming it means your device is affected by the virus.so first you will have to remove the virus from your computer and for removing the virus from your device i am telling the steps plz follow it: go to RUN and type cmd in your computer. then type dir/w/o/a/p and enter. then you will get such as autorun.inf newfolder.exe and others having.exe or .inf files. so now type attrib-h-r-s-a*.* and then enter now type like del newfolder.exe or the other one and press enter. virus from your device has been removed.
I think you are facing a virus problem if it was a virus problem then go to http://xviruslab.blogspot.com and download Quick Heal Total Security (PC Mobile Scan and Data Theft Protection, Anti Phishing) or Quick Heal Anti Virus Plus mail me if you're facing any problem
There can be multiple reasons for that. There is a well known virus which won't allow computers to update antivirus and also in my opinion this antiviirus is not good you can find much better than this. As a computer expert i'll recommend you nod32 and after that Avg. You can install anyone of them it'll give you much better results. Free versions of both are available on websites you can try free version before making purchase decision.
In order to remove virus try this.
Goto command prompt type cd.. until you reach c drive then type dnscache it'll clear you dns cache and you'll be able to visit antivirus site. Update and run full scan.
Actually this virus blocks dns of security sites and redirect to your ip
scan for the viruses as its the problem of any of the viruses has entered the operating system as its blocking the system to get started .check whether your antivirus option is ON and enabled.if not make it enable.
do a system restore. you must have gotten a very special worm or trojan that seems to be acting as a back door. you can also try to start up in safe mode(by pressing f8 during boot) and then delete it.(it may disable the virus) also, try unplugging your ethernet cord from your computer.(may be blue or black, plug on end looks like a very big telephone plug)
Task Manager can be disabled by 2 main ways..  Either there is a virus on your machine-- Or It was manually disabled. --The 1st solution is to get an anti virus which is up to date and run a virus scan to delete the viruses that maybe present.
--The second solution is that on your START MENU, click on "run". On 'run' type "gpedit.msc".. Under the "User Configuration" , click on " Administrative Templates".. Then you double click on "system" .Double click on "Ctrl+Alt+Del Options"... Double Click on " Remove Task Manager" and click on "Disable"... Click on "Apply" and "Ok" Your Task Manager should now work !!!