Toolbar.dll is a file used by numerous programs, thus when the Toolbar.dll file fails to load it can be associated with many applications on your computer. It is also worth noting that many spyware programs hide themselves on your computer by using this file name, so it is necessary first to run a virus check when you see this message to ensure that this possibility is eliminated.
Aside from possible malware, the most likely program to utilise the Toolbar.dll extension is the AOL Toolbar. Should there not be a malware or virus-related reason for seeing this message then it indicates that something has gone awry with one of the popular Toolbars which can be added on to your browser. Usually this can be attributed to a virus or malware.
The first thing to try with this problem, aside from a virus check, is to reset your browser settings. This can slightly vary depending on your browser, but all mainstream browsers offer a fairly similar process to avoid confusion.
To reset settings in Internet Explorer, firstly close all open windows.
Next find the Internet Explorer icon, right-click on it, and select ‘Tools’, and then ‘Internet Options’.
Select the ‘Advanced’ tab, and then click ‘Reset’.
Within the ‘Reset Internet Explorer Settings’ dialog box, again click ‘Reset’.
Internet Explorer will then take a few seconds to carry out the requested process. Once this is complete, click ‘Close’ or ‘OK’. Your PC must be restarted in order for the new settings to take effect.
It is worth noting that this may have reset any security or privacy settings that you applied to Internet Explorer, so it may be worthwhile for you to note any sites to which you have applied such preferences.
If you run a virus check on your machine, and it either comes up blank, or after you’ve killed the viruses and malware which your virus checker finds on your machine, then you can then eliminate the possibility that the problem is a virus. If the issue persists then carry out the following procedure in order to reset your toolbar features.
Firstly, go to the Start menu and type ‘Turn Windows Features on’. When the dialog box opens, uncheck the Internet Explorer options then click ‘OK’. You will then need to restart your computer.
Again go to the start menu and repeat the process to open the ‘Turn Windows Features on’ menu. Enable Internet Explorer then click ‘OK’, and restart your computer again. This should now have solved the problem, and when you run Internet Explorer again it should work seamlessly.