big oops pls help quick fix

need someone to tell me how to reset the data.pak file to open with windowsshellcommon component again i was playin around and lookin at stuff got a phone call at the wrong time and boom im boned

so if someone could tell me the root back to that in vista it be great
and yes i know im an idiot so no need to say it thx all

try to system restore, and then back to date known good config

was havin errors just did a fresh dirty install/fix on system so ehhh no system restores in place atm just need to find the windowsshellcommon.dll to point the data.pak to in order to open still need help pls

im sory mostly i aware winsdows xp...vista get suckzzzz with me too last month ago...
now im using windows Xp pro sp2 build 2600 all my online games is working good...no error..
im not forcing you to have windows Xp pro sp2..but i guess this windows is better for online gamers....

agreed i love xp vista sux <insert various animal part here>
still if anyone has location for this dll pls feel free to drop it on me