Almost everything I do whether send an email or load a webpage it takes a very long time since I updated the latest version of Firefox; what can I do?

I updated to Firefox 14.0.1; my Operating System is Windows Vista on my Compaq Presario C700. I have taken it to the computer repair shop and they said they found a Trojan and removed it. It was still operating VERY slowly, so I took it back in. They said they could not find anything more. I removed MANY of my desktop icons and eliminated some of the programs from my start up menu. It is still taking up to 5 minutes to load some pages even just send an email!

Hi,
Please try the [https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems Reset Firefox] feature via '''Help''' ('''Alt''' + '''H''') > '''Troubleshooting Information'''.
(To revert to the previous profile you were using, close the new profile (i.e. exit Firefox), start Firefox and choose the '''Default User''' profile. While the [https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles Profile Manager] is open, you can also delete the newly reset profile (the one containing random numbers), or the former profile, as the case may be). If the reset is okay, it would be a good idea to delete the old profile as otherwise it would be left intact with the previous data until deleted.
[https://support.mozilla.org/en-US/kb/Managing-profiles Managing profiles]
[https://support.mozilla.org/en-US/kb/Profiles?s=profile&r=2&e=sph&as=s Profiles Howto]
If the issue is due to Windows malware, posting in a dedicated security forum would also be helpful:
http://www.bleepingcomputer.com/forums/forum79.html
http://www.spywarewarrior.com/index.php
http://www.spywareinfoforum.com/
http://www.wilderssecurity.com/

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