How to fix expired internet certificate to be valid

Hi:

I need your help please. After my technician added an "F Drive" in my computer besides my "C Drive, " totally not more that 1 Gb. He fixed
and got me back my video sound and driver which I accidentally deleted.

Then I have problem to open my Google browser which I have all my
emails every day and some internet problems that I bought. Google
mentioned that I have to fix "Expired certificate." when I turned on
my computer which mentioned that : I changed the CPU, needed
re-enter cpu settings in CMos setup and remember to save before quit!
Cpu ratio changed fail. Set cpu ratio as default, remember to save before
quit! Asked me to set up my computer clock and updated. I had the date
in 2000. I did update the clock, only I cannot change from am to pm.
I still have the same problem now. I remembered my technician typed
the date updated in the Bios and Cmos section. Probably he did not
do the other work ! I do not know.

I need desperate help please. If you send me email now I cannot activate
your Link because I cannot get into my Google browser for my emails.
I used "internet explorer" I can get to you and other websites but cannot
get into Google Chrome.

I have Win XP, 512Mb for C drive and 40 GB for F drive. 512 K modem.
Internet Explorer 7. I appreciate your help. Thank for your help

From: Virginia Mooe
Brooklyn, New York, USA.
My email: internet999a@gmail.com