What are "hibernation file cleaner" that appear in vista's disk clean up and are they safe to delete?

also is it safe to delete 1. debug dump files 2. setup log files 3. system error minidump file 4. temporary files 5. thumbnails 6. per user archived windows error reports 7. per user queued windows error reports 8. system archived windows error reprts 9. system queued windows error reports i just want... show more also is it safe to delete
1. debug dump files
2. setup log files
3. system error minidump file
4. temporary files
5. thumbnails
6. per user archived windows error reports
7. per user queued windows error reports
8. system archived windows error reprts
9. system queued windows error reports

i just want to clean all unnecessary files in my vista...
2 answers 2