Think i have a virus, causing porn to appear when i search+ boxes wanting me to dl

Okay i have a virus of some sort that whenever i click something says i have viruses infecting my computer with a dangerous virus that needs to be cleaned before it crashes.

This and i also have porn popping up whenever i google or yahoo search anything. A big picture will appear saying" Your computer has been infected by a dangerous virus. some results was changed by porn advertising.you must clean your system immediatly to prevent it. download the newest antivirus softwear.

someone please help

Print these instructions out.

1. Download SUPERAntiSpyware Free for Home Users:
http://www.superantispyware.com/

* Double-click SUPERAntiSpyware.exe and use the default settings for installation.
* An icon will be created on your desktop. Double-click that icon to launch the program.
* If asked to update the program definitions, click "Yes". If not, update the definitions before scanning by selecting "Check for Updates". (If you encounter any problems while downloading the updates, manually download and unzip them from here: http://www.superantispyware.com/definitions.html.)
* Close SUPERAntiSpyware.

Restart computer in Safe Mode.
To enter Safe Mode, restart computer, and keep tapping F8 key, until menu appears; select Safe Mode; you'll see "Safe Mode" in all four corners of your screen

* Open SUPERAntiSpyware.
* Under "Configuration and Preferences", click the Preferences button.
* Click the Scanning Control tab.
* Under Scanner Options make sure the following are checked (leave all others unchecked):
o Close browsers before scanning.
o Scan for tracking cookies.
o Terminate memory threats before quarantining.
* Click the "Close" button to leave the control center screen.
* Back on the main screen, under "Scan for Harmful Software" click Scan your computer.
* On the left, make sure you check C:\Fixed Drive.
* On the right, under "Complete Scan", choose Perform Complete Scan.
* Click "Next" to start the scan. Please be patient while it scans your computer.
* After the scan is complete, a Scan Summary box will appear with potentially harmful items that were detected. Click "OK".
* Make sure everything has a checkmark next to it and click "Next".
* A notification will appear that "Quarantine and Removal is Complete". Click "OK" and then click the "Finish" button to return to the main menu.
* If asked if you want to reboot, click "Yes".
* To retrieve the removal information after reboot, launch SUPERAntispyware again.
o Click Preferences, then click the Statistics/Logs tab.
o Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
o If there are several logs, click the current dated log and press View log. A text file will open in your default text editor.
o Please copy and paste the Scan Log results in your next reply.
* Click Close to exit the program.
Post SUPERAntiSpyware log.

RESTART COMPUTER!

2. Download Malwarebytes' Anti-Malware: http://www.majorgeeks.com/Malwarebyt...are_d5756.html to your desktop.

* Double-click mbam-setup.exe and follow the prompts to install the program.
* At the end, be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
* If an update is found, it will download and install the latest version.
* Once the program has loaded, select Perform full scan, then click Scan.
* When the scan is complete, click OK, then Show Results to view the results.
* Be sure that everything is checked, and click Remove Selected.
* When completed, a log will open in Notepad.
* Post the log back here.

The log can also be found here:
C:\Documents and Settings\Username\Application Data\Malwarebytes\Malwarebytes' Anti-Malware\Logs\log-date.txt
Or at C:\Program Files\Malwarebytes' Anti-Malware\Logs\log-date.txt

RESTART COMPUTER!

3. Download HijackThis:
http://www.snapfiles.com/get/hijackthis.html
Post HijackThis log.