Can't I have a virus????

Hi everyone,
I just got this new MacBookPro and I'm trying to get use to it.
But I'm having this problem with the password required to install softwares.
Sometimes when the password window come up, the keyboard doesn't type the exactly letter. I mean, I choose "u", and I get "g". This only happens when this password is required. When I'm working all day long on a different kinds of sotwares I never get this problem.
Can I have a virus or something??
I'm also working with Parallels Desktop (with Windows XP) where I got to delete it a couple times because of virus. So, is it possible that I got a virus from the windows????
Thank you for any advice.
Viv

Can I have a virus or something??
Well, you probably already read from the others that you don't have to worry about a virus for the Mac side of things.
I'm also working with Parallels Desktop (with Windows
XP) where I got to delete it a couple times because
of virus. So, is it possible that I got a virus from
the windows????
Now..., on the other hand, the Windows environment (-itself-) can be susceptible to those Windows viruses. It won't spread over into the Mac side of things, though. It may mess up your Windows environment that you're working in. But your Macintosh computer will be working okay.
I do have an Anti-Virus program. It's call VirusBarrier from Intego. And it runs in the background (if I want to run it that way) all the time. Well, I've had it running for close to a year and have never heard one single "peep" out of it, for anything. Today was the first time it squawked at me.
Apparently there was some web page that had a file that it wanted to download and it was an infected file. However, it was for Windows. VirusBarrier still gives a warning, even if it has nothing to do with the Macintosh.
The item in question was -- "W32.DNSChanger.Gen". It's something that apparently can cause your computer to redirect to a fake web page for some financial institution that you have, so that it can take the information and steal whatever, from it. But, as I said, in this case, it was something that worked on the Windows side.
By the way, Intego also has a product where it will protect both the Windows and the Macintosh sides. You might check that out, if you're concerned.
iBook G4 1.42 GHz & iMac G4 Flat Panel 800 MHz   Mac OS X (10.4.8)  

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