Identities at log-in turning into Chinese

Hi, I've used Identity Safe to store my usernames and passwords for various sites I visit.  I have recently started to experience something weird - my user name gets changed into Chinese!  I have copied some below - I copy and paste them into Google Translate and strange sentences are revealed.  Am I the only one to experience this?  Do I have a virus, despite Norton Internet Security being installed and Power Eraser finding nothing?  I am on a new Acer laptop, running Windows 7 and I'm in Cambridge, UK.  This is worrying me, so any help or advice would be much appreciated, thank you.

 

῱㣌儒쭑ᜪご㕽튉⼒ࠝ娖喇ꝴ箼

炙퓢톗魓籝፦᩿⇩퍮榋链

殷괚ヌ沽뵵翦笮Ꜹ謮礱㝝拌錟첀껡唗䛿槾Â䥖颡ᅡ䬊밽㖸

⃨锜蛄???웦䱏堺꿏㜢菱띆䑑頎닶

襑ᑎ킄螹ಮ✑环㳼㐧呗斯㪜ꆪ킓

ୱ꩚蘮⽆೘ᘐ㤫태꜕៪덓뇫뒙

ퟲ뤧ꥳ룀軺씐졀譥胘튟⏨