It is safe to delete the Debug Dump files. They are uuseless infformation to the average user. Another good way to free up disk space is to delete the Prefetch files, but you need to stop them coming back again. To do so you need to edit the registry as follows ...
Prefetching (the reading of system boot files into a cache for faster loading) is
a commonly overlooked component that can have a significant impact on
system boot time. This tweak allows you to select which components will
make use of the prefetch parameters. To see which files are gathered using
each setting, clear the prefetch cache located at C:\Windows\Prefetch and
then enable one of the settings listed in this hack. Clear the cache and repeat
for each setting.
Set the Registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\
Session Manager\Memory Management\PrefetchParameters\EnablePrefetcher
to 0 to disable prefetching, 1 to prefetch application launch files, 2 to
prefetch boot files, or 3 to prefetch as many files as possible.
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