Do I have a virus or malware, spyware ?

Hi,
Bit worried right now..two things that i observed today.
1. when i opened apple.com, I had a advertisement banner on top of it. First I thought, apple website was hacked, then realized..apple is find...darn, its my system that has been compromised...
Opened safari and still the same. Then I downloaded macscan and it said all clear. restarted and it went.
2. My mac just blinked..as if I a screenshot was taken..much like the way we take screenshot on iphone by pressing the home and sleep button.
Do i have virus or malware, key logger screenshot logger..i dunno what else it could be? how do i find out my system is secure ??
Thanks, Pj

See the following as relevant:
*First Mac-based botnet becomes active*
The first known botnet to exploit Mac OS X has been activated, security researchers claim. The network is believed to have been put in place by iServices, a Trojan infection accompanying some pirated versions of iWork '09 and Photoshop CS4. Although downloaded at least 20,000 times by the end of January, the Trojan's payload has remained dormant for some time, in the same manner as many Windows botnets.
Symptoms of the active iServices botnet may begin with excessive CPU usage on a Mac, the result of a PHP script instigating denial-of-service attacks on websites. Many anti-virus programs have been updated to block iServices however, and it may also be possible to halt the Trojan's operations by deleting "System/Library/StartupItems/DivX" and/or "System/Library/StartupItems/iWorkServices" folders. Some security companies, such as SecureMac, are offering removal tools specifically targeted at iServices.
In spite of the potential number of infected computers, the danger from the current botnet is expected to be minimal, both as a result of security measures and the limited vectors of infection. Symantec researchers warn, though, that the code in iServices is designed to be extremely flexible, and as such modified versions may appear in upcoming months.

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  • I seem to have a virus in my iPad email.  Provider has shut me out until it is fixed.  How do I fix it?

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     Cheers, Tom

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    That is not a virus.
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  • If the iMac is suppose to be secure from viruses, malware,spyware and other internet threats, then howcome i have seen internet security programs for the iMac?

    on the website it clearly stated "It’s highly secure and reliable"  and that "You don’t need to buy software to speed it up, keep it safe, or get it to work better."  and it also says that "The built-in defenses on a Mac help keep you safe from viruses and malware without the hassle of constant alerts and sweeps."   If this is the case, then howcome in download .com, i have seen internet security programs for the imac?
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