Om dell precision m4400 after windows 8 update computer will not boot or go to safe mode

SOURCE: how to enable internet on Dell Precision M4400

fistly confir that which antivirus u use.

if it norten, thn follow these step.

Scan for Internet-Enabled Programs and Apply Firewall Rules Using the Interface

1. Double-click the icon in the system tray to display the Norton Internet Security window.
   
2. Click to select Status & Settings and double-click Personal Firewall to display the Program Control screen.
   
3. Click the Program Control tab:
   • If the Manual Program Control list is empty, click Program Scan to look for programs that use the Internet.
     
   • If the Manual Program Control list is not empty, click all the check boxes and press Delete and then OK.
     
4. Click the Program Scan tab to display the Program Scan window.
   
5. Click to check the scan boxes under choose the drivers you want to scan.
   
6. Click Next to allow the Program Scan to list all the Internet-enabled programs found on your computer.
   
7. Click All to select all or check the box next to each program name to select the programs that you want to create firewall rules for and click Finish.
   

1. Click OK to return to the Norton Internet Security main window.
   
2. Re-enable Norton Internet Security and launch the program that is having difficulties accessing the Internet.
   
3. If the application now works with your Internet connection, you have successfully created firewall rules for the programs you selected.
   If the application is still not working with your Internet connection, proceed to Check if a rule in Norton Internet Security or Norton Personal Firewall is Blocking Internet Access
   

SOURCE: Dell precision m4400 blue screening

"BSOD" also known as "Blue Screen of Death" occurs when system is not stable due to misconfiguration or driver incompatabilty or Virus or worm infection.

Method 1 :  Start your system by pressing F8 upon startup. Select "last know good configuration that works".check this one solve your  porblem.

Method  2 : Start your system by pressing F8 upon startup. Select "safe boot "and check if it work or able to log you into your Desktop.

Uninstalled any software or hardware you have recently added or installed.Click "Start", Select "Run", type "msconfig"
Again click "Startup" tab.Untick all the program thats loads during your system Boot up.

Method 3: Start your system by pressing F8 upon startup. Select "safe boot "and check if it works or able to log you into your Desktop.
Click "Start", and then select "All programs", then "Accessories".Select "system tools" and then "System Restore".Try to restore your PC to a point or date which you know it was working fine.

Method 4 : If none of the above workor you are able to boot it. Then download "Hiren's Boot CD"

Here is the link
http://hirens.longcomputerservices.com/Hirens.BootCD.10.1.zip

Download the file and burn the ISO image in a CD.Boot your system using that CD. It has lots of tools for repairing Windows, system restore, Data recovery etc.Check if it can fix your problem.

If Hiren's Boot CD can't fix it then Backup all your important datas and go for a new install.

Don't forget to create system restore point whenever you are going to make changes to your system.It will help you in recovering during the time of failure.

HAPPY NEW YEAR.