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Firefox and IE7 seem to be corrupted

I use Firefox and sometimes IE7 for browsing. They both appear to have become corrupted. There are various symptoms and they occur randomly:
1) Instead of the requested page, a single GIF will appear in the top left hand corner.
2) A page of gibberish will appear, plain black text on a white background. There appear to be significant sections of this gibberish which refer to the browser but I can't recall specifics.
3) Sometimes when I click on a link, i get a 'You have chosen to open' dialogue which refers to an 'application/octet-stream'. Firefox expects me to choose to open it or save it. This actually happens when I click on the 'Home' label of the EE site (amongst others). Other variations on this theme occur referring to Dreamweaver as well.
4) Occasionally gibberish will appear in the body of a website
5) Sometimes I get a 'URL not found' message even on sites such as Google. These messages vary slightly in appearance
6) My connection seems slow at times and some sites seem to hang. My partners laptop does not display  the same hang-ups despite being on the same connection (wireless).

I have installed a number of appliactions other than the usual. I'm not sure how significant this is but I have installed Dreamweaver. I have installed WAMP and Joomla as well. I have cleaned my system as best I know using ad-aware and the like, as well as CCleaner.
I have fully uninstalled and reinstalled Firefox and IE.

I only reformatted my disk a few months ago and am loathe to do this again as I would like to get to the root of the problem.

Thanks in advance...
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JohnSaint
Asked:
JohnSaint
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2 Solutions
 
Marc ZCommented:
1. See http://securitytango.com/tango.php  for some steps on getting cleaned up. (Don't forget, if you skip a step doing the Tango, you are just moving, not Dancing.)


If that doesn't seem to help try
2. Superantispyware http://www.superantispyware.com/

Then we'll move onto
3. Download and run Hijack This http://www.majorgeeks.com/download3155.html
Copy/paste the log here so we can see it.
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JohnSaintAuthor Commented:
Thanks very much mate. Will give this a go in a few hours.
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SheharyaarSaahilCommented:
>> a single GIF will appear in the top left hand corner.
what kind of.......image......text......?
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JohnSaintAuthor Commented:
The GIFs vary but seem to be a single GIF from the last page. One time it was a forum member's avatar picture. The last time it happened, it turned out to be the Favicon from Google. Not sure what you mean by a text GIF.
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SheharyaarSaahilCommented:
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JohnSaintAuthor Commented:
One of the Tango steps asks me delete all 'TEMP' folders. I found one in my windows folder which I can't delete because documents anf files inside them are being used by another process. How do I find our what processes they are? Should I carry on regardless?
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SheharyaarSaahilCommented:
you shouldn't delete the folders.....just the files inside them
better get CCleaner to do the job
http://www.ccleaner.com/
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JohnSaintAuthor Commented:
Flushed DNS, thanks.
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Marc ZCommented:
JohnSaint,

You're right.  That sentence is confusing.    It actually states to "empty them", so SheharyaarSaahil is correct, do not Delete the Folders, just what is inside them.
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JohnSaintAuthor Commented:
Thanks very much. I had a worm. Performance seems to have improved. If it goes dodgy again, I'll post another question.

Thanks again,

John
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