Win 7 64bit home premium Service pack 1
AMD Athlon
Ram 4GB
AV BT NetProtect Plus from McAfee

Started Calibre last night 20:12 have not used it just minimised.
20:12 7350 K
21:12 25487 K
22:12 47344 K
23:12 50292 K
00:12 54284 K
08:12 86268 K
10:12 92934 K
11:12 98904 K
13:12 105480 K
15:12 188596 K
17:12 120520 K
20:12 139736 K