As both computers have internet access via the router, they are already "networked". You should set at least one folder as "shared" in each PC by right clicking it and selecting the Sharing & Security option. The firewalls in both computers need to be configured to allow local network traffic through and that should basically be it.
However, there is an additional issue when accessing a PC with XP "Pro" installed. You need to be logged into the "client" PC with a Username/Password that matches a User Account set up in XP Pro.
<<< Also if possible how do i make the wireless connection safe, as it shows my wireless point as unsecure. >>>
There will be settings in the router to enable WEP or WPA encryption. Enable this by creating and entering a "key" and you will then have to enter the same key into the Wireless Adapters' software to be able to connect to the network.