Do I have a virus? Avast blocking sites.?

[Daniel]

Yesterday I was in Facebook, I tried to go to the main page but it just wouldn't load so I closed it, I tried to go into Facebook again but an Avast message popped up and said "
URL:http://www.facebook.com/
Process:file://C:\Program Files\Google\Chrome.exe
Infection:js:ScriptIP-inf [Trj]"
So I tried to log into my Facebook account from my phone, but I couldn't. I googled the virus and read these horrible things about how criminal can steal your banking information with it, so I freaked out a little and decided to delete Chrome. Now, the problem is, I can't access any of the sites related to my Facebook e-mail account (Youtube or Hotmail) because Avast pops the same message. I already scanned my whole computer with Avast and found only two files infected, which had nothing to do with Js: Scrtipt info Trj, but apparently I cannot access Youtube from my PS3 or phone, actually I can't even do an Internet search with them. Also, today, I restarted my modem and I was able to log into Facebook and Youtube from Chrome with no problem, but it just happened again. What can I do?