T41 with w 7 sleeps but refuses to hibernate

[T400plus]

My software setup was damged by some unwelcome software.I had to run sfc to get it working again ..especially the network part..
Now,the notebook can sleep but when i request for a hibernate,it writes to the disk and after some time just whistles and continues with the same screen as if nothing was asked for.
Any software solutions?.
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T41 2374 7FU(++ 1.7 Ghz cpu,160 GB HD,1.5GB memory)