The taskbar of my computer shows an icon with the following balloon tip:
Would you like to update your security software an ddownload Registry Cleaner?
Upon running antivirus nothing is dangerous is detected. What to do?
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find out which company that baloon tip redirects to. You have installed a software, most probably shareware from the same company which is advertising. It is basically adware. Either remove the software or look in its options for some way to disable it.
its again appesrs 2 b a rogue. turn off system restore for the moment. use rogue remover. and then finish off with ccleaner. scan in safe mode for best results.
if it dznt help pls post ur hjt logfile here.
manual removal instructions for this rogue 'registry cleaner 2.5' here.