hello there, i am using vista home edition and i lost my cd but i have cd key behind my laptop as everyone have that one.So i dont know in this situation how do i re-setup my vista or repair.Now the problems that i am facing.I am using the hidden adminstator account.It was good but i guess i was effected by some virus.I was using bit deffender antivirus with all the latest updates.Also i use to update my windows regularly.But now i cant update my vista or run any programs properly.At first problem that i faced which is when i click any program it comes with the choose promt i mean when a program does not have the extention like for example .exe like .zip etc dont have then a choose promt come so same thing happen in everything even songs videos programs that i need to choose from the promt again the same file even i go though the program files i need to choose.Also i lost my admin rights i dont know why that thing happen.Then i clear my pc with advanced system care 3 pro and fixed 2424 registry problems.But the problem didnt stop yet.Now when i click any programs or anything a message comes with : this file does not have a program associated with it for performing this action.Create an association in the set associations control panel.But this when i click right mouse button and run as start it works.Like open run as adminstator then start button.and this is happening to every program.No program is running in the time of start up . even not antivirus or any program i need to click start to run any program so can anybody help me to solve this issue because i am in a big problem i guess.