Windows 7 icons and extensions problem

[JacksMafia]

i have windows 7 x64 and i had a problem that's been annoying me for years now which is this ,i set a custom folder icons for nearly all the folders on the hd and also cause i have 27" monitor i set the view to extra large icons now everything was working fine until one day the view were set to titles so i sat it back to extra large icons and as soon as i close the folder it went back to titles again
as i said i had this problem for years now i tried to fix it but had no luck and it wasn't a breaking point for me to stop using win 7 since it didn't effect performance at all but recently i started to see another problem when i double click a pdf file windows doesn't open it automatically but ask for a program to open it reinstalling adobe reader helps but after couple of days it went back and started to have that problem with a lot of other extensions like mp3 files,rar ,zip,and html files and other extension i use for work
as i said i have tried every fix i could find but none of them worked does anyone know what could cause this ? and how to solve it ?
another thing i will be installing a new win 7 on a new machine and i want to avoid having this problem is there anything i can do?

 

[torchwood]

hi

you hav'nt changed your windows scheme by any chance, each has to be set up individually

why not set firefox as you pdf reader

 

[JacksMafia]

hi

you hav'nt changed your windows scheme by any chance, each has to be set up individually

why not set firefox as you pdf reader

no didn't change windows scheme and i don't use firefox at all