first run a virus scan...if you already have then skip this step...if you haven't and a virus is found and dealt with, try running LW again..this may need a uninstall then reinstall of LW...

if the above fails, then do Start>run and in the command line box that pops up type in chkdsk /r hit enter...then answer y (yes) and hit enter, then reboot...this will check your Hard Drive Disk (HDD) for bad sectors and 'repair' them (actually it will try and retrieve the data, move it to another location on the drive, and then mark that part of your HDD as unusable)