HDD（ハードディスク）への異常なアクセス
毎日、0時10分にHDDへの異常なアクセスにより、PCのパフォーマンスが悪くなります。
HDDのアクセスLEDが20秒程連続的に点灯していたので、"procmon"で調査したところ、
その結果、この時間帯にだけ、SECURITY.LOG と SECURITY へのファイルへのアクセスが非常に多きことがわかりました。
なんとかこれらのアクセスを無くすか、減らすためにどうすればいいでしょうか？
現在の環境はWindowsXP Pro SP2 です。
ネットワークには接続しておらず、ウィルス等には感染していないと思います。
"0:10:18.0364302","lsass.exe","1456","WriteFile","C:\WINDOWS\system32\config\SECURITY.LOG","SUCCESS","Offset: 512, Length: 512, I/O Flags: Non-cached"
"0:10:18.0368462","lsass.exe","1456","WriteFile","C:\WINDOWS\system32\config\SECURITY.LOG","SUCCESS","Offset: 1,024, Length: 4,096, I/O Flags: Non-cached"
"0:10:18.0372399","lsass.exe","1456","WriteFile","C:\WINDOWS\system32\config\SECURITY.LOG","SUCCESS","Offset: 5,120, Length: 12,288, I/O Flags: Non-cached"
"0:10:18.0377985","lsass.exe","1456","FlushBuffersFile","C:\WINDOWS\system32\config\SECURITY.LOG","SUCCESS",""
"0:10:18.0378395","lsass.exe","1456","FASTIO_ACQUIRE_FOR_CC_FLUSH","C:\$LogFile","SUCCESS",""
"0:10:18.0378471","lsass.exe","1456","WriteFile","C:\$LogFile","SUCCESS","Offset: 21,180,416, Length: 4,096, I/O Flags: Non-cached, Paging I/O, Synchronous Paging I/O"
"0:10:18.0381434","lsass.exe","1456","FASTIO_RELEASE_FOR_CC_FLUSH","C:\$LogFile","SUCCESS",""
"0:10:18.0381549","lsass.exe","1456","WriteFile","C:\$LogFile","SUCCESS","Offset: 8,192, Length: 4,096, I/O Flags: Non-cached, Paging I/O, Synchronous Paging I/O"
"0:10:18.0613844","lsass.exe","1456","WriteFile","C:\WINDOWS\system32\config\SECURITY.LOG","SUCCESS","Offset: 0, Length: 512, I/O Flags: Non-cached"
"0:10:18.0617957","lsass.exe","1456","FlushBuffersFile","C:\WINDOWS\system32\config\SECURITY.LOG","SUCCESS",""
"0:10:18.0618263","lsass.exe","1456","WriteFile","C:\$LogFile","SUCCESS","Offset: 12,288, Length: 4,096, I/O Flags: Non-cached, Paging I/O, Synchronous Paging I/O"
"0:10:18.0780787","lsass.exe","1456","FlushBuffersFile","C:\WINDOWS\system32\config\SECURITY","SUCCESS",""
補足
アドバイスありがとうございます。 メモリは2GB積んでいます。 メモリ以外で原因になりそうな事がありましたら、教えてください。 ちなみに、PCスペックは、 CPU : Core 2 Duo T7700 RAM : 2GB(1GB×2) OS : XP Home です。 よろしくお願いします。