Windows 7: Help with icons

Im new,so i don't know if this is the right section. Hello everybody,i have a problem with my pc,i don't know how to fix it.Last day,i downloaded 1 file,i did open with (then choosed to open with daemon tools) and then all other programs like internet explorier,all games like needforspeed, and almost all programs changed icons to daemon tools icon,and for example when i want to open skype,it opens with daemon tools and i can't like open skype normaly.Then i tried to open paint,and now every program open like paint.. heres some photos:




See,all the programs icons are now paint,and when i try to open like skype,it writes :


It writes on every other program that i try to open. Can anyone help me ? ? ? ?
P.S Sorry for my poor grammar.

Hello Povilas and welcome to Seven Forums.

You could try rebuilding your icon cache or restore default file extension associations.

Icon Cache - Rebuild

Thanks,but it didn't work for me,still all the icons are in paint,and can't run any program.

try a system restore to day before.
System Restore

How can i try system restore? (don't know what is it or how to do it)

Hello Povilas, and welcome to Seven Forums.

Clicking on the System Restore link in the post above will take you to a tutorial that will show you step by step on how to do it.

Hope this helps,
Shawn