Xp hangs and pc stop responding during Xp...

Question

Acer aspire 1642.
problem begings as 1 day mouse and keboard slows very much.

I reinstalled win Xp no improvement.
I changed partition reinstalled win Xp ,no improvement.(mouse and keboard are ok in begining of installation, in middle they slow down.)

I installed Norton antivirus update it scaned computer i found a virus ,i deleted the virus and again formated window for reinstallation.
now it hangs during installation.