I am using Windows XP SP3.

H:\Bitcoin>dir
 Volume in drive Q is BITCOIN
 Volume Serial Number is XXXX-XXXX

 Directory of Q:\Bitcoin

2013-02-21  09:31 AM              .
2013-02-21  09:31 AM              ..
2012-09-18  10:19 AM                 0 .lock
2012-09-18  13:57 PM         3,850,240 addr.dat
2012-09-27  12:05 PM           131,072 backup.dat
2012-09-18  13:25 PM     2,097,384,811 blk0001.dat
2013-01-04  10:34 AM     2,097,346,788 blk0002.dat
2013-02-20  22:13 PM     1,561,011,203 blk0003.dat
2013-02-20  22:18 PM     1,809,104,896 blkindex.dat
2013-02-20  22:28 PM              blocks
2013-02-21  09:22 AM              chainstate
2013-02-20  22:18 PM              database
2012-09-24  08:41 AM                 0 db.log
2013-02-21  08:31 AM           564,356 debug.log
2013-02-21  09:31 AM           956,384 peers.dat
2013-02-21  09:18 AM           172,032 wallet.dat

What can I safely delete? I highlighted in bold and color what I think can be deleted. Can someone confirm this?