Is this a browser hang only? Flash player still isn't ready for 64 bit, I believe.
Check your Event Viewer>Admin view to google repeat errors to find how others have resolved them.
Check also the Performance log on Advanced Tools page at Computer>Properties>click WEI score link. Look for cued issues at top of Tools page, Generate a System Health Report.
Type Problems in start search box to see if any solutions have been sent.
Make sure your drivers
are up to date. Check optional Windows Updates and Device Manager, then the Support Downloads webpage for the computer or device model.