It could be our old friend BAD CAPS that on a cold boot will start with one thing like this then vanish on a reboot (I'll keep this short as there are hundred reply posts on the web about that) to other issues like a failing HDD or cable.
160GB HDDs haven't been made in years so that's a clue this is getting old. Be prepared, the end is nigh.
Strange thing is happening during window 7 boot. The problem is not regular but sometimes happen. Problem is window sometime REPEAT SOMETIME NOT EVERYTIME will not boot and that time IDE 160 GB SATA HDD does not show in bios mode. I power off and on that time window boots. What could be the possible error.
Shall I need to do by changing SATA data cable connection between HDD and motherboard