No Text on Web Pages, Just Lines?

[desktop]

Sometimes when I come to a webpage there is no text on the page—just lines everywhere. I've attached a couple screenshots to show you what I mean. This happens with all three browsers—Chrome, IE and Firefox. All three browsers are up-to-date and I haven't had any other issues with them, except this.

What's also weird is it also happens even on Winamp. When I open the Media List sometimes all I get is lines. This doesn't happen all the time, just once in a while. So I'm not really sure what it could be.

I scan daily for viruses and malware and empty my computer's cache with CCleaner. I haven't noticed anything weird on my PC, except for that line thing in the browsers.

If anyone can tell me what might be causing this or give me some ideas on how to find out I'd appreciate it.

Thanks

[PrintDriver]

Are all of your browsers up to date. I had issues like that when I could no longer update my old comp's OS to handle the latest browsers.
It still irks me that even when up to date, some flash-heavy sites still don't work well.

[<b>]

Since it's involving fonts across different apps, have you considered that it might be a corrupted font file?

[mojoprime]

yeah. looks like a font issue. also, have you set a custom style to force your pages to render in a certain font?

[Designia]

I have a similar problem in Chrome. I know its a font problem because it goes away when I clean my font caches but I still haven't been able to figure out which font Chrome is using.

[kemingMatters]

Check your sets of Helvetica that include fractional glyphs, usually the perpetrator.
In your browser settings you can also override your default font.