I made an adware?!

first of all, i made a toolbar for internet explorer from the program Toolbarstudio, from besttoolbars.net

Anyhow, avast finds this toolbar of mine as an Adware (Win32:Adware-gen), but other anti-virus programs didn’t detect this…

But the statement from the site said that they don’t include spyware or some sort in the compilation, and yes, i didn’t see any spyware when i installed this on other computers, no crashes and other mishaps occured…

is this really an error or is there really a hidden virus on my program… please confirm this for me… thanks…

I think there may be a problem with the current Avast virus definitions database. Did you notice a virus deifintions update just before you hade the problem? See also http://forum.avast.com/index.php?topic=21246.0

You could also check the offending/suspect file at: Jotti - Multi engine on-line virus scanner if any other scanners here detect them it is less likely to be a false positive. You can’t do this with the file in the chest, you will need to move it out.
Or VirusTotal - Multi engine on-line virus scanner

If it is indeed a false positive, add it to the exclusions lists (Standard Shield, Customize, Advanced and Program Settings, Exclusions) and check scan it periodically using the ashQuick scan (right click scan), when it is no longer detected then remove it from the exclusions.
Also see (Mini Sticky) False Positives