auto cad 2008激活时，申请码不断变化

我的cad试用已经到期，用注册机算出的激活码也可以激活，但是单击最后一步“完成”时，就又要重新回到激活的界面，并且申请号发生变化，下面是他们的保存的记事本文件内容：
2208 2009/01/10 23:39:39 Reason=License repair
2208 2009/01/10 23:39:39 ComputerName=20081106-1307
2208 2009/01/10 23:39:39 OS=5.1.2600 Service Pack 3
2208 2009/01/10 23:39:39 RequestCode=YCHD LK1S 3ZXR HXP3 VGA6 YFGG
2208 2009/01/10 23:39:39 AdlmError=13
2208 2009/01/10 23:39:39 VendorID=1
2208 2009/01/10 23:39:39 VendorError=15400
2208 2009/01/10 23:39:39 ExpirationDate=2009/01/17
2208 2009/01/10 23:39:39 Behavior=Unregistered Version
2208 2009/01/10 23:39:39 Usage=In Trial
2208 2009/01/10 23:39:39 License_Install=2009/02/23
264 2009/01/14 09:53:03 Reason=License repair
264 2009/01/14 09:53:03 ComputerName=20081106-1307
264 2009/01/14 09:53:03 OS=5.1.2600 Service Pack 3
264 2009/01/14 09:53:03 RequestCode=SY3T 5GHY XZGE JLP3 7EAY TFC9 ZZS2
264 2009/01/14 09:53:03 AdlmError=0
264 2009/01/14 09:53:03 VendorID=1
264 2009/01/14 09:53:03 VendorError=0040
264 2009/01/14 09:53:03 ExpirationDate=2009/01/17
264 2009/01/14 09:53:03 Behavior=Permanent
264 2009/01/14 09:53:03 Usage=Commercial
264 2009/01/14 09:53:03 License_Install=2009/02/23
1884 2009/01/14 10:12:41 Reason=License repair
1884 2009/01/14 10:12:41 ComputerName=20081106-1307
1884 2009/01/14 10:12:41 OS=5.1.2600 Service Pack 3
1884 2009/01/14 10:12:41 RequestCode=H20C 93PQ 1XZ2 X953 4Y8Z WPKL 47KS
1884 2009/01/14 10:12:41 AdlmError=0
1884 2009/01/14 10:12:41 VendorID=1
1884 2009/01/14 10:12:41 VendorError=0040
1884 2009/01/14 10:12:41 ExpirationDate=2009/01/17
1884 2009/01/14 10:12:41 Behavior=Permanent
1884 2009/01/14 10:12:41 Usage=Commercial
1884 2009/01/14 10:12:41 License_Install=2009/02/23
3912 2009/04/14 10:37:24 Reason=License repair
3912 2009/04/14 10:37:24 ComputerName=20081106-1307
3912 2009/04/14 10:37:24 OS=5.1.2600 Service Pack 3
3912 2009/04/14 10:37:24 RequestCode=VTCW HXRZ S8S3 LJ53 CXY6 4ZHT X8TP
3912 2009/04/14 10:37:24 AdlmError=0
3912 2009/04/14 10:37:24 VendorID=1
3912 2009/04/14 10:37:24 VendorError=0040
3912 2009/04/14 10:37:24 ExpirationDate=2009/01/17
3912 2009/04/14 10:37:24 Behavior=Permanent
3912 2009/04/14 10:37:24 Usage=Commercial
3912 2009/04/14 10:37:24 License_Install=2009/02/23
急切盼各位高手指点！！！！

相关了解……