Solve : Problem with fonts maybe???

Hi I have for sometime a curious problem with my fonts or something.. A random letter appears to be lower than the others sometimes. In a window, in a dialog box, when writing in notepad but not in all applications at the same time. Sometimes it goes away by itself. Maybe it has to do with effects. I disabled them all but it still appears. I've already checked for my regional settings. Don't know what else could be wrong..  Can u help me? :-/



Virus/spyware/adware solution that you use on a regular basis is __________________.

Have you been monkeying around with your fonts? Changing desktop settings? Any pertinent info on when this started? Your operating system is ________________.I am fooling around with themes but the problem was obvious from the moment I installed windows. In the very first dialog window that appeared for regional settings during installation. But the first time I saw it i thought it will be fixed easily.. But it remains for MONTHS now..  :-/

My OS is XP pro with sp2. For the time being i use only nod32 as an antivirus. No adware installed yet [format yesterday..]I BET you have some already. Alexa for sure.  
Download AdAware at least to find out.
http://www.download.com/Ad-Aware-SE-Personal-Edition/3000-8022_4-10045910.html?part=dl-ad-aware&subj=dl&tag=top5

What kind of video card is in there? Do you have the latest drivers?nlite removed alexa. at least it said so.. MSI 6600GT my video card. Latest drivers on. I don't think it has to do with video card though. It was also happening with my old radeon9600XT.And it does that after a fresh format and reinstall? Or just an over the top reinstall?after fresh format and reinstall.  :-/Do you have just a plain jane PCI card you put in there to test the theory that it is not the card?no i don't have any pci video card to test that.Have any friends who would let you borrow one briefly?It would make it easier to isolate where the EXACT problem is.ok tested pci card and i saw it again. but i found something else. this time the problem appeared with S. meaning the capital S was a bit lower than the other letters in a word. i went to diplay properties> appearence > effects and I changed the method to smooth edges of screen fonts to standard. When i HIT apply the problem was solved instantly. But after an hour or so it reappeared with another letter>. I did the same thing and changed the method to cleartype. Again the problem was fixed but i can't do that all the time..  This problem needs to be solved and i'm so fed up with it anymore.  here it goes again in the screen..  
God i'm so tired with it. it's like this 4-5months now.. if anyone has a suggestion please help. i would much appreciated.

Does this happen with a default installation of XP from a vanilla XP CD - No themes, NLite not used etc?yes it was from clean installation. Nod32 was causing the problem finally dispite the fact of different hardware tests with it on. I was unlucky with Nod32 and I guess I'll have to move on with another antivirus software.