This is not the correct forum,the virus & security is more applicable to you situation.
Here's a LINK
I had a similar issue,this the link that helped me.
I downloaded Windows Defender from MS web site. Whe I try to install it, I get a pop-up message "This installation package is not supported by the processor type". I'm using XP Home Edition with a Dell computer with an Intel Pentium 4 Processor at 2.0 GHz. Any help would be appreciated.