【問題】上網出現Sorry, Unable to process request at this time -- error 999.

上YAHOO點有些連結出現
Sorry, Unable to process request at this time -- error 999.
Unfortunately we are unable to process your request at this time. This error is usually temporary. Please try again later.

If you continue to experience this error, it may be caused by one of the following:

You may want to scan your system for spyware and viruses, as they may interfere with your ability to connect to Yahoo!. For detailed information on spyware and virus protection, please visit the Yahoo! Security Center.
This problem may be due to unusual network activity coming from your Internet Service Provider. We recommend that you report this problem to them.
While this error is usually temporary, if it continues and the above solutions don't resolve your problem, please let us know.

Return to Yahoo!
Please try Yahoo! Help Central if you need more assistance.

有的不會...請問這個是要如何解決....啊...

大意是：
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現在無法處理這個網頁連結需求，錯誤編號 999

我們現在無法處理你的連結需求，這通常是暫時性的，請稍待在嘗試

如果你一直看到這個錯誤訊息，可能性的解決方案如下：

你可能需要掃描你的系統，有無間諜軟體或病毒.....

這錯誤也可能是你的 ISP 網路問題造成的....

不論如何這個錯誤通常是暫時性的，如果它持續出現且我們建議的方案也無法解決你的問題，請聯絡我們知道.

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有時電腦中毒，的確會造成某些網站無法連上

因為病毒連續攻擊這些網站 (DDoS 攻擊）
所以這些網站的防護機制，把你的 IP 擋掉

遇過一次，Google 無法連上，說有病毒攻擊它，所以 IP 被擋了
結果是區網內有電腦中毒