求教,XP系统需要好多次启动才能进入,并加载ExDLL.dll时出错,请指教!

我的系统是WINX，大概有四五天了，每次启动时，都要启动几次才能启动成功，启动中老是出现一个蓝屏，提示说出了一个问题，有一次提示：The problem seems to be caused by the following file : msgpc.sys. The driver mistakenly marked a part of it's image pagable instead of nonpagable.
系统经几次启动成功后，打开网页时系统提示：加载 C:\\windows\Downloaded Program Files\901865\ExDLL.dll 时出错，指不到指定的模块。

请高手不吝赐教！挺急的！多谢了！