I installed 2antiv in my pc,now pc speed became very slow,many programmes are not responding,when i try to remove 1 antiv it not responding ,please help me You should only install 1 A/V...
It's possible it's not removed properly...or your infected.

What apps are these ? ? Some need removal tools.I have had norton & webroot for years but suddenly there seems to be a problem after a recent webroot update. Can't connect to internet, cant shut computer down without a hard shutdown, ctrl alt delet wont work, and cannot access control panel unless in safe mode. All seems to have started after last webroot update in which their PAGE changed it's look.Norton Removal Tool...

Re-boot afterwards...Patio: So you think the problem is with Norton? Can't uninstall in safe mode so I'm kinda in a bind.Not sure what your saying...you should be ABLE to run the uninstall from safemode...
Also i'm not sure i would recommend webroot...but thats just personal opinion...

Try to use this.

Microsoft Security Essential an anti virus for WINDOWS OS
http://www.microsoft.com/security_essentials/

In my opinion i think its not recommended to use DUAL anti virus or more.
It leads that computer run slowly and emergences if different unusual error.

Note: Microsoft Security Essential runs only in Microsoft Genuine products.
Who's feeding the Parrots again...? ?Patio, Tried again to remove Norton in safe mode..no luck. Ran a malware progam and it found a problem and repaired. Rebooted and the problem remains. Can connect to the internet in safe mode  and access control panel but in a normal mode nothing seems to work.  I'm new at dealing with problems so I'm feeling my way along and at this point I'm looking at RUNNING recovery and start over......hopefully this makes some sense to you.Let us know what protection scans you have run...

Then we can go from there.
No 1 app gets them all unfortunately...Try the removal tool for Webroot while in "Safe Mode with Networking"
  http://uninstallers.blogspot.com/
or Appremover,
  http://www.appremover.com/
Then try Norton Removal Tool, may take more than one run with reboot to be effective.
While still in "Safe Mode with Networking" download, install, update and scan with
MalwareBytes Antimalware, remove all detected, reboot into safe mode with networking
and download and run Hitman Pro, removing anything detected(may require reboot again)
  http://www.malwarebytes.org/
  http://www.surfright.nl/en/downloads/
Decide whether to reinstall Norton(if paid for)or opt for another "Free" ANTIVIRUS such as
Microsoft Security Essentials, Comodo, Clam AV; something light on resources and less
conflict with other antimalware apps whether they be on-demand scanners or
"Real Time Protection"

I experienced the same problem and chose Appremover because they had a free demo and it helped