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ahm.. i have 3 os disk.. one is a mod which i downloaded "windiows diamond 2010", another one is windows black 4.0 sp3 and an original sp3 disk.. xp pro.. gosh.. even if i formatted my pc it still has errors such as programs not working, explorer not working, system restore not accesible as well as task manager, regedit and even msconfig, some games does not work and worse some hangs!!! plzzz help.. ive already lost 99 percent of my important datas:(