Did you do a system restore and Virus/Malware/Addware scan, are you sure the Java's up to date, one copy not so long a go was flawed and open to attack.
Try un-installing and re-installing all browers and any add on's/Java/Flash player and what ever else you have.

Hello,

Do you still require help with this issue/question?

Please post back if you do need further assistance.

JB.