Hi
I have a Pentium 4 PC with configuration of 3.06GHz, 512MB RAM, 80GB HDD, 250GB External Hard Disk. I am using Microsoft Windows Vista ultimate O/s for 3 months. It worked well but about 1 week ago my heat sink unit has stopped working and I have changed it. New heat sink unit is working quite well and PC is working very silently. I have reinstall the O/s after heat sink changed because the O/s has been corrupted during the failure of old heat sink unit. Now O/s is working well except one problem which I am facing regularly.
When I start my PC it shows the following message:


DDR333-->Operating in Single-channel dynamic paging mode.

496MB System RAM

Legacy Keyboard .... Detected
Legacy Mouse......... Detected
USB Legacy............ Enabled

Fixed Disk 0: PM-HDS728080PLA380
ATAPI CD-ROM 3M-HL-DT-ST RW/DVD GCC-4522B
USB Mass Storage Device: WD 2500BEV External 1.05

A: Drive Error
CMOS/GPNV Checksum Bad
CMOS Date/Time Not Set
Press <F4> to run setup

After pressing <F4> it enters into BIOS Settings. Every time I set the time and date settings, disabled the floppy drive booting (because I have not installed it in my PC) and press <F10> to save the changes and exit. Then the O/s works well. but when I again restart my PC it shows the message:

Press <F4> to Resume

By pressing <F4> again the O/s works well. But after successfully shut down the PC when I again started my PC to working on it the whole process again appears. I am very much fed up and annoyed with this problem . It is very horrible state for me when I thought that every start up my PC enters into bios and if anybody else will work on my PC, he/she change the bios setting intentionally or unintentionally by mistake then what will happen.
kindly tell the solution to this problem. How this problem can be resolved.
Regards,
S.D.Sharma

i have ran into this problem a couple time at my job, Try removing the battery from the motherboard to reset the CMOS it works about half the times on the pc's i have encountered the same or similar problem with.

your battery has ran out of Life , propable , try replacing it with a new one
PS : battery voltage for any MB 3Volts

Sounds like these guys solved your problem. As for your concern about someone being able to change your BIOS, you should password protect it. This will prevent anyone from taking a backdoor route into your computer. I recommend this for everyone.