Lineage 2 closes when minimized

[Gx4]

I have a problem (i didn't had it before) when i minimize(alt+tab) Lineage 2 c3 (i play on a private server) and click with mouse to reopen it terminates itself(alt+tab doesn't work when l2 minimized it did before).
It wasn't before, i tried reinstaling the game didn't helped .

My PC
(notebook compaq nx9030)
Intel pentium M 1.4ghz Dothian
512 SDR RAM
integrated 64mb video (intel extreme graphics 2, more exactly Intel 82852/82855 GM/GME)
WinXP home SP2.

EDIT: fixed with system restore