Downloaded infected program

Depress the power button for a few seconds till the computer turns off. Wait a few seconds and restart.

Where does it freeze, during startup, or once within Windows? If you make it somewhere into the Windows operating system, restart, and during startup, peck on F8 key till you get to the B/W Startup options. Cursor down to "Safe Mode with Networking", and press the Enter key. If it makes it to Safe Mode, use "System Restore" (SR) to back up to a date before the problem occurred. If SR isn't available, or doesn't work, enter Safe Mode again, use your IE, Firefox, Google Chrome, or Opera browser to go to www.download.com. In the right-hand column of Most Popular Downloads, you'll find Malwarebytes. Download and run that program to see if the problem came from a malware infection. Follow the instructions to scan, and afterwards to remove the infections, then restart the computer.

Follow this trick to fix infected Laptop:


Disable Unwanted Programs from Running at Windows Startup
Running too many programs at the Windows startup reduces the system performance. To speed up Windows 7, you have to disable the unwanted third-party programs from running at Windows startup.

• Click Start ' Type MsConfig and press ENTER
  
• Click Startup tab.
  
• Uncheck the entries of the programs that you do not wish to run at system startup.
  
• Click Apply.
  
• Do the same for the entries in the Services tab.
  
• Click Apply ' OK.
  
• Restart the computer when prompted.
  

To fix this problem instantly use PCFresher system utility.

I would suspect it in a startup program, say CyberLink. It's set to start at Windows Startup. Open the webcam software for your laptop and disable Start at Windows, OR download CCLEANER freeware at : http://www.filehippo.com/download_ccleaner/ .This is a good program to learn to use. You can clean the junk from your machine and in the TOOLS section, STARTUP, look for your webcam startup program, disable it. Disable ALL unnessary startup programs to speed boot and shut downs.

Possible corrupt operating system. The cause of corrupt operating system is Windows file corrupted or virus infected Windows.

Solution corrupt Windows files:
1. START - All Programs - Accessories - System Tools - System Recovery Options - System Restore (restore to the date when the OS is still normal)
2. START - All Programs - Accessories - System Tools - System Recovery Options - System Image Recovery (restore using a backup system that you created)

Solution files corrupted due to virus infected windows
Update anti-virus and virus scan (if the virus is detected, the primary action = repair, secondary action = quarantine). Then repair the operating system with System Restore or System Recovery Options.
Note:
If the operating system infected with virus (virus infected not long ago), the best solution is to use System Restore. Restore to a date when the windows are still normal.

Scan the Computer using any latest updated anti virus program for any potential threat.

If the computer is not infected by any virus or trojan then you may also try performing System restore to the time when the Computer worked normally.

If the Computer keeps shutting down randomly after turning ON then the Power Supply Unit in the Notebook requires service.

Depending on the operating system your running, click on the start button in the bottom left or the vista icon, then either click on "RUN" or in the search box type MSCONFIG and press enter.

Click on the startup tab and then clickon the disable all button. Then click on apply and then okay and then let the computer restart.

After it restarts if the error message stops appearing then you know its something that is starting up when windows boots.

Go back into msconfig and then you can enable any of the programs that you want to startup instead of the ones that you don't.

You should probably use something like CCleaner (www.ccleaner.com) to clean up your temp files. Also, uninstall any old software or stuff you no longer use. Run a scan for viruses and/or malware to make sure you are not infected.

RUNDLL32 is the Microsoft Windows program that loads DLLs into memory so
that they can be used by specific programs or by Windows. This behavior
could be associated with a programs not responding properly or is associated
with spyware programs and viruses. Anti-virus software and firewalls do not
fully protect your system against the majority of spyware and privacy
threats. Spyware is commonly bundled with software downloads, attached to
e-mails, or transmitted through networks so it can appear to be legitimate
software, but once installed it can be nearly impossible to detect and
remove without the help of a dedicated spyware removal tool such as:

Ad-Aware 6.0 (build 6.181)
http://www.lavasoftusa.com

SpyBot 1.3
http://www.safer-networking.org/

SpyWare Blaster
http://www.javacoolsoftware.com/spywareblaster.html/

HiJackThis
http://www.spychecker.com/program/hijackthis.html

Please make sure that you download the updates for each of these programs to
ensure complete detection of known spyware programs. Although nothing is
absolute in removing spyware and keeping it off, downloading and executing
the programs above can dramically decrease future infections.

Also please utilize free virus scans from the following sites:

Trend Micro
http://www.trend.com

Bit Defender
http://www.bitdefender.com

Panda
http://www.pandasoftware.com/

McAfee
http://www.vil.nai.com/vil/stinger

After Spyware / Adware is remove, you may get an error finding files on
reboot

After you use anyone of these programs (with the exception of HiJackThis)
you may receive an error of some sort after rebooting your system. This is
pretty common. Many spyware programs add themselves in the Startup location
and execute when Windows boots. If you recieve an error when rebooting after
removing spyware, do not panic. This is more than likely a startup remnant
trying to access the spyware program that is no longer on your computer.
HiJackThis is a great utility to find and remove these startup remnants.
However, there is a less technical way of removing these items:

(1) Click START to RUN and type: msconfig
(2) Select the STARTUP tab
(3) Uncheck the file that pertained to the startup error message you
received
(4) Click APPLY and OK
(5) Reboot your system

If this fails to fix the startup error message after reboot, there are still
options:

(1) Navigate to C:\Documents and Settings\All Users\Start
Menu\Programs\Startup
(2) Delete the icon that pertained to the startup error message you received
(3) Navigate to C:\Documents and Settings\username\Start
Menu\Programs\Startup
(4) Delete the icon that pertained to the startup error message you received
(5) Reboot your system