When I search things in google it will sometimes redirect and the tab says its loading a page called doubleeclick.net
I generally reclick the search button and it will run the search but if I try to open links almost always it will load something called portal query and then redirect me to some strange page.

I dont have a high proficiency with technical aspects so I won't be able to look through my files for the virus and my antivirus isn't detecting any virus although it does occasionally finds suspicious files, i follow the file path into a temp folder in my appdata but its stored in a folder that doesnt appear there.

Additionally, and im not sure if this is due to the virus, I have tried to donwload some files recently and it says the download fails but then the files do download however when I attempt to run them it launches a window requesting i select a program to launch it with, this shouldn't be happening and I am not sure why.