all text in browser replaced by symbols with hex numbers
Last week I detected and removed a trojan (ukash) which my pc contracted while visiting some dodgy site with Firefox. Even though the trojan has been removed completely, I cannot reinstall any version of Firefox (english or other languages), as all text is replaced by box-like symbols with hex numbers.
For example, the import wizard dialog box looks like this: http://i43.tinypic.com/2qwlkhx.jpg
I suspect somehow the default font has been changed to one not supported by Windows, but even with a complete uninstall and removal of all personal settings, the symbols reappear. Is there any way to change the default font? Please remember I cannot change anything within the program, as all text is scrambled in this way, even text I enter in the address bar, so about:config is not accessible.
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It sounds like your computer may still be infected with some sort of a virus / Malware.
I suggest the following resources:
To double check your system is clean, do the following (Not official Mozilla advice, just good practice from personal experience)
Download and Install MalwareBytes Anti-Malware, run a full Scan. http://www.malwarebytes.org/
Download and Run TDSSKiller http://support.kaspersky.com/faq/?qid=208283363
Download and Install Microsoft Security Essentials http://windows.microsoft.com/en-US/windows/products/security-essentials (not an official endorsement, but I personally recommend MSE as an awesome permanent anti-virus)
Double check for all Windows Updates.
If you are still having problems with Malware after that, I would recommend either http://www.bleepingcomputer.com/virus-removal/, or having your computer cleaned by a professional.
That can also a problem with how Windows handles text that is not in Unicode
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