Trojan On Paypal site

Scary stuff happened to me today
Went on to the PAYPAL site signed in message you have a trojan AAAAHH ! get out off here.
Went to the chest in avasti said it was contained. Tried again signed in happened again, tried to make an invoice happened again ???
logged out very puzzeled Ran a full scan not finished yet, has affected my whole day !
Started reading about it online but became very disturbed then seen this forum and signed in
first time here.
so hopefully get some answers
Have a Windows 7 64bit pc
HELP

Just tried VT http://www.virustotal.com/index.html Came up 100% clean in all respects
Going through the threads on this nasty message.

Hi All
The threads on this topic are very helpful. Still running a full scan.
Found that I can sign into paypal with Google Chrome without any further messages and feel a whole lot better.
Thanks to the avasti Forum
Regards red53

attach a screen shot of the avast warning…

Thanks to the avasti Forum
the name is avast.... not avasti ;)