I was going to download a file from the internet with firefox and the website said i needed a plugin. i downloaded the plugin and installed it. Now i get pop ups every 5 minutes and on a few of them it says its coming from F:\Documents and Settings\Yuri\Local

What plug-in did you download? What is the exact error you're receiving, and can you post a screen shot? Life's more painless for the brainless.

i dont remember what plugin i installed. i just discovered something really weird! everytime the words "windows defender" are displayed anywhere in my browser, my firefox warns me that im about to close it. I never pressed anything to close it. good thing i have the "closing window" warning on. Even if i search windows defender in google, my browser tried to close. when i try to open windows defender, it closes within a second before i can click on it or anything in it. When it opens for that second i can see that there is a warning in it with a red alert. It looks like it found a virus but it wont stay open long enough for me to remove it. so can this firefox closing and windows defender closing be related?

i managed to take a screen shot the second windows defender opened and right before it closed.