How much free space u have in ur Windows System Drive ??
also, to know whether u have BAD sector or not, run a check disk,
Go to
Start >>
RUN >> Type
cmd, now in the command pront, type
chkdsk x: /f change the X with ur Drive letters

now the result will show if any bad sector and the amount of it as if there are any,
Note for Windows Drive and boot drive and for the drive where page file is, u would be asked to restart the system

as check will run when restarting

, this because ofthe /f switch which asks windows dish checker to repair if there is any problem