ok when i scan my comp every 3 days or so, i scan with AVG 7.5 and at the start it finds kernel32.dll i looked up that it controls my memory (input and output) is it a error? what should i do?
Well you know it could also be a spyware because they usually hide behind real names. I suggest you post a Hijackthis log in the computer security section to be sure it's not a bad spyware...
You are probably seeing this file as changed. This does not imply a virus or adware activity. What has happened is that AVG records the location of files in memory. This is fine until Windows comes along with another update which changes the location of files in memory. AVG is simply telling you that the file has changed location.
To rectify this problem open AVG click on Test Centre and then click on f3. This will force the scan of files and you will get a window to accept or reject the changes. Accept the changes and on the next regular scan you will not see this problem again.