求助！！电脑经常蓝屏！！请高手帮忙！
我公司的一台电脑，总是蓝屏，蓝屏上的内容显示如下：A problem has been detected and windows has been shut down to prevent damage to your computer.
DRIVER_IRQL_NOT_LESS_OR_EQUAL
If this is the first time you've seen this stop error screen,restart your computer.if this screen appears
again,follow these steps:
Check to make sure any new hardware or software is properly installed.If this is a new installation,ask your hardware or software manufacturer for any windows updates.you might need.
If problems continue,disable or remove any newly installed hardware or software.Disable BIOS menory options such as caching or shadowing.If you need to use sage mode to remove or disable cornponents,restart your computer,press F8 to select Advanced startup options,and then select sage mode.
Technical information:
*** STOP:0X000000D1(0X0000004C,0X00000002,0X00000000,0XF87AF000)
*** usbehci.sys.-Address F87B2688 base at F87AF000,Datestamp 480254ce
我的电脑是非常老的了，主板是2002年买的，最近新换了一个明基刻录光驱和一个新硬盘。但是蓝屏在换设备之前就有了，原来的老硬盘有坏道，我以为是硬盘不行了，所以换个新的，可是电脑运行不过一会就又出现这种蓝屏了。。
到底是什么原因，请高手帮忙帮我找出来，或着提供几种修理的方法。谢谢了！！！
