Installation of April 13 updates for W7 home premium 32 bit rendered Dell XPS m170 laptop unbootable, goes into automatic repair mode on attempted boot. Repair is unsuccessful, system restore is unsuccessful, repair with installation disk unsuccessful as is attempt to boot into safe mode, all resulting in a continual loop into repair mode. Had to reinstall windows as couldn't install backup image successfully. A second attempt to install part of the updates had the same result. Any suggestions?