network connection problem

[TheTempestSonata]

OK, I have three computers connected to one router.

Computer 1 - Wired

Computer 2 - Acer Aspire One WiFi

Computer 3 - Desktop, WiFi Linksys v.4.2 PCI WiFi card with Hawking Tech. High Gain Antenna..

I've never had any problems with the desktop that's connected wifi... now, i ping google at 149ms... my Aspire does it in 24 and the wired one is 13...

Also, with the Desktop, Facebook doesn't work properly with Firefox, IE, or Chrome... The versions of each and the versions of the JRE are all the same on my Aspire, and they work fine with that.

Security is different on both... Kaspersky Internet Security on the desktop, McCafee and Windows Firewall on the Aspire.

and to add to this, from the desktop in question, i ran speedtest, and I average around 1.5mb download and 786kb upload (I have DSL, so it's about average)

[TheTempestSonata]

Now the desktop wont even connect to the internet.

Just because I don't know better, could this be a virus problem?