bad page ID in MSDB DB

Hi All,
Greeting,

Sql Server 7
OS: Win NT

In the sql server logs i see the below error alerts

I/O error (bad page ID) detected during read of BUF pointer = 0x11e09e80, page ptr = 0x446b4000, pageid = (0x1:0x2c78), dbid = 4, status = 0x801, file = F:\MSSQL7\DATA\msdbdata.mdf..

Error: 823, Severity: 24, State: 1

Please help me in this.

Thanks in Advance
AdilHere's one place to look: http://support.microsoft.com/kb/q281809/