when starting in safe mode and showing hidden files i cant find any programs to uninstall related to adware.gen.
Use process explorer to see if there is any process running related to adware.gen.
Hello, if you are unable to find programs related to adware.gen under programs and files options, there are chances that it might have been renamed it using obfuscation strategy. It would be wise to run full system scan using preinstalled antivirus. If you have not installed any antivirus till now, better go for free tools. However, using free tool will only help in detection of the malware infection such as adware.gen in your case. If you want to have it removed permanently , you need to opt for Licensed version.
Alternatively, you can also try manual steps to delete adware.gen. For more details refer this working guide http://www.removemalwarevirus.com/remove-adware-gen-activity-3-how-to-delete-adware-gen-activity-3