Malware Trouble

I feel my system is overrun by malware at this point. I have the following things happening.

1. Random windows keep popping up with advertisements when I'm using firefox.

2. Google results redirect to sites that I did not click on.

3. Updates to MS Windows (I run XP) are not installing.

4. System is running slow, and keep getting weird windows errors.

Please help me clean my computer out. I have run both malware bytes and windows security essentials.

Thank you.

By posting just a description of your problems it is likely that your topic will be passed by and you will not receive the help you're looking for.
We need to know what's running on your computer so that we can provide the appropriate instructions.

May I draw your attention to THIS topic, which you should have read, that states what we need you to post, so we can help you.
If you still need help, please start a new thread an include:

• A HijackThis log.
• An Uninstall list.
• Details of the problems you're experiencing.

If for any reason you can't run HijackThis, please let us know in your post.

This thread will now be closed.