|"I had to reformat my computer"|
What do you mean you HAD to? What problem were you having that caused you to reformat/reinstall?
"when I reinstalled windows it's SP2"
That's means you have an older XP disk. SP3 is a 316MB download available from the Microsoft site. I suggest you download it directly rather than getting it thru Windows Update. Copy it to a disk in case you ever need it in the future. You can get it here:
"I installed the wireless drivers and such"
Meaning? Motherboard chipset, graphics, audio, network, etc? After you installed the wireless drivers, you should have gotten a wireless icon in the system tray (next to the clock). Right click on the icon, select "view available wireless networks", highlite CAY13, then click connect. You will then need to enter the security password.
"I want to avoid downloading viruses"
That's why there are anti-virus programs: