Browser buffers no viruses can be found

Am running windows 7 and am using Firefox I have Microsoft Security Essentials,SuperAntiVirus.Malewarebytes,Ad-Ware, and Panda Anti-Virus.I've scanned a number of times and still little to nothing is found.And as am typing this up I swear if am typing up a sentense of 7 words when I get to the second to the last third letter only 3 or 4 letters show up.My screen buffers alot and does this flickering like a TV screen when it does this...Its been frustrating me for weeks.My computer runs faster when I do a Full System reboot.Is it possible no matter how much I clean my computer are there viruses that cant be found with antivirus? Is there anything I could do to secure my computer from infection or completely clean it without going through the trouble of a Full System reboot?
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Clarification Request
Any known conflicts?

We had to "pop the hood" so to speak in a recent discussion and found software conflicts. You can tell more and read what we found at Overclocking advice.

For now, for today there is no way to secure a Windows PC that does not involve making the PC almost unusable. And folk that have tried often have created a mess.

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A quick fix

to try.

Remove all but one anti-virus. They can all conflict with each other and slow a computer down to a crawl.

I see Microsoft Security Essentials, SuperAntivirus, (not heard of that one), and Panda anti-Virus. Choose one, but not that SuperAntivirus if that is the correct name, and uninstall all the others.


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