A problem with fonts

Hello guys i`m new here and i have a problem.About a week ago my computer don`t respond at any command when browsing with firefox.I reset my pc and on logon page appear strange characters not letters or numbers.I manage to log on,i type my pass and work,but everything in my pc was only strange characters.I find on internet how to restore fonts,because no font were in my windows folder fonts.It works but not all my fonts were put back in fonts.Is there a possibility to restore all my fonts or just there all important?I have downloaded some fonts from dafont.com but i think something is missing or is a malware problem.I have install Vipre Premium and Malwarebytes Pro on win 7 ultimate 64bit,no problem about 1 year.I scan with both and find anything,scan with hitman pro-nothing,NPE-nothing,i don`t scan online,i do a scan with hijackthis and nothing strange or maybe i don`t known how to read.Bad part is that it happened twice in 7 days.

By posting just a description of your problems it is likely that your topic will be passed by and you will not receive the help you're looking for.

We need to know what's running on your computer so that we can give you appropriate instructions.

May I draw your attention to THIS topic, which you should have read, and which tells you what we need you to post so that we can help you.

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