Update will not connect to server, continuous lagging and questionable security?

I actually have a few questions. I recently switched to Firefox from IE9 for a few reasons. My IT Security professor mentioned Firefox was safer than most and an online article suggested it was faster than IE9. So I decided to give it a chance; the previous version was too slow and wouldn't play any video so I downloaded version 4. It worked great for about 3-4 weeks and now I'm having the following problems:
1. Every time Firefox says it has to update, the window pops up to connect to server. All it does is continuously try to connect (nothing happens). Now, one time I left it open all day to see if it would and that night a window popped up and said to restart Firefox to complete. I did what it said and it just started trying to connect to the server again.
2. When I first downloaded Firefox 4 it was fast and almost never lagged. Now, it seems as if every page I try to connect to lags. In fact, sometimes I have to close it down and restart. It's actually normal pages I open everyday like school, mail, weather and typical Yahoo pages. Nothing has changed on my end, so I'm unaware of why this is happening now.
3. I'm really concerned with the security issues. I still have IE9; recently, because of lagging and security issues, I've tried switching between the two to check cleaning details. I'll run my cleaner after a day of IE9 and do the same for Firefox (same typical searches). With IE9, there's not much to clean, maybe 17-18 mb's at most (cookies, typical stuff) and never had a virus. The CPU monitor also stays calm. On Firefox, I get 160-210 mb's every time. The CPU gauge fluctuates constantly and I've had three viruses.
I'm not sure if it's because the updates will not take or what, but I've had to switch back to IE9 because of these problems. I really enjoyed Firefox (when it worked); the interface was easy to navigate and use and in the beginning was very fast. I miss it! But because of these issues, I have to take a break until they are fixed. I can't afford to have my computer crash. Please help!

If there are problems with updating then best is to download the full version and uninstall the currently installed version.
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder] and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
* http://kb.mozillazine.org/Software_Update (Software Update not working properly)

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