Computer restart at an earlier date

This is the second time he does that, he scratched a bit before you start and then I see a page saying that the battery is HS (this is not a laptop I have a central unit connected consent).

I press F2 to continue, so far everything is going well ... except that I realize it is 1:15 of the mat (while it is 7:45) and that we are this morning.

The last time my anti virus and did not follow all the updates , it seems that this time it is OK.
At the moment it is strange or it starts quite normally, or is rather long.

So I am under windows XP, my anti virus is Kapersky

may be you try to replace your cmos battery

This is a button-type battery CR2032 Lithium 3 Volts, the operation is very easy. The loss of the system time indicates a loss of data instead of CMOS, this memory is preserved through the button battery that powers this memory when the PC is off.

For the slowdown at startup:

Do a scan and antiviral antimalware.

Make a check disk and then defrag.

Change any of the same button cell may have been stored for some time before being put into service and it costs almost nothing.