硬盘速度变慢?

最近许多以前正常rm/avi,在同一台电脑上总是断断续续(realplay or media play),幻灯一样,无virus,请教为何 ?
OS: windows 2000 SP4, even after restoring OS w/ SP4.
memory check ok.

是硬盘速度变慢? something wrong windows 2000 w/ SP4?
how to correct?

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