when i switch on my computer,
a "windows activition" pops out and tell me my product key is invalid
this limits my computer to function normally
i have 3 choices
1. buy a new key from the net
2. activate with a key
3. contact benq for support
in fact this is my second times encountering with this problem)i forgot how i solve it last time)
is there anyway to stop it from happening again?
thx