網頁一直變成這樣 請問是什麼問題

最近登入學校的網站
網頁就變成了這樣

-----------------------------------------------------------------------------------------

Network Security Quarantine

Your computer has been quarantined because it was detected launching an attack across the network.

Quarantine Details

* Attack Detected: HTTP: Microsoft ASP.NET Path Validation Vulnerability :1
* Quarantine Start: FRI SEP 10 02:51:50 2010 UTC
* Quarantine Duration (min): 15

Security Details

* Network Access Zone: Block All Access
* Sensor: TP-2700
* Health Level: UNKNOWN

Host Information

* Current User: N/A
* Host Name: N/A
* IP Address: 118.160.84.183
* MAC Address: N/A


Copyright© 2008
McAfee® Network Security Platform
All rights reserved
www.mcafee.com

-----------------------------------------------------------------------------------------



請問這到底是什麼問題呢
只有進學校網站才會變這樣
其他網站都不會
朋友的電腦使用都正常 沒問題
我一進學校網站就成這樣
掃毒我也掃過沒有中毒
可以麻煩高手幫我解決這困擾的問題嗎
謝謝