XP Wireless Question - Unable to locate Certificate

Hi,
I started having troubles with my XP machine in the garage out of the blue it started doing this.
I have tried everything I can find with google searches, tried them all still no luck.

Machine is
Windows xp Sp3
Linksys Wusb54gc v3
Dlink825 router

I have checked the time and date,
I have noticed it was auto checking the 801.blah blah in advanced, unchecked.. no joy.
It seems to be reconfiguring my settings, or not saving them.
I go back to check the settings in advanced, and even deleting the preferred network and inputing manually.. and it'll reset options like my security back to open from wpa or wpa2.
My router is setup, and it actually will allow connections from wpa/wpa2 automatically.

I have not had any problems initially setting this up about 3-4 months ago, as I said I have this machine in my garage and use it to pull up pdf service manuals when I need them.
Then today it just keeps doing this, and it's really pissing me off.

also I read someone to do ipconfig /flush dns .. no joy.

everything no joy... arrgg!!!
ohh and signal strength is maxed out.

I did try that, several times.. it kept turning it back on.
I did manage to get it work tho,
I went out there and said this is it you little F* .. with all the intent on trashing it, as it is an old 486 single core thunderbird pos now, beast in it's day..

so anyways, I am not sure what exactly I did.. or if it decided to stop being tempermental.
I'm just hoping when I need it again it doesn't pull this garbage as I've wasted a day mucking with it.