When i try to go to a website for example facebook the browser takes me to a porn website or an advertisment?

[Casca Longinus]

Redirecting is a symptom of a rootkit, and rootkits require anti-rootkit programs to detect/remove. Run these two programs to remove the rootkit(s):

Click on the tdsskiller.exe link to download:

http://support.kaspersky.com/faq/?qid=208280684

Then run this one:

http://public.avast.com/~gmerek/aswMBR.htm

Rootkits usually install other malware so I suggest you run a FULL scan with MBAM after to check for other malware:

http://www.techspot.com/downloads/4716-m...lware.html

Then update, and run a full scan with your AV program.