When I'm working on my computer a message appear saying that my computer have viruses and runni

note: when i check with my antivirus for viruses its appear that there are no viruses,spyware or threats

what should i do?

When I'm working on my computer a message appear saying that my computer have viruses and running slower?anti virus

you have a trojan that displays those pop-ups and tries to convince you that you are infected. if you click on the message it would suggest you to buy some security program, but don't do so. your antivirus can't detect this threat because it's not a virus. antiviruses only deal with viruses and antispyware deal with everything else. i assume you don't use antispyware yet. i suggest you to download spybot and run a scan: http://www.2-spyware.com/review-spybot-s...

When I'm working on my computer a message appear saying that my computer have viruses and running slower?auto protect

Sounds like you got infected with one of these:

Anti Virus Pro

AntiSpyware Pro

Do you see a blue ball down by the clock with a white ? in it?

If so, go to these and check:

Install , update and then scan with this:

Super Anti Spyware http://downloads2.superantispyware.com/d...
make sure that ur virus guard is up 2 date
make sure u have a good anti-virus, and it is up 2 date.
Kaspersky online scan