First of all suggest to diagnose disk any bootable tool for exampl
->MHDD 'HDDGURU: MHDD
(
http://hddguru.com/content/en/software/2005.10.02-MHDD/
a scan also at presence some viruses for example by using liveCD wit
Kaspersky 'Kaspersky Rescue Disk Free Download and Reviews - Fileforum
(
http://fileforum.betanews.com/detail...k/1213647614/1
if everything is O
try both metho
1.System restore by using DVD Vista -method
http://www.vistax64.com/tutorials/76...store-undo.htm
2.Repair Instal
http://www.vistax64.com/tutorials/88...tall-vista.htm
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Flavius