Try this:
Open a terminal to add this ppa and install HAL.
Type each line and press enter at the end of each line.
sudo add-apt-repository ppa:mjblenner/ppa-hal
sudo apt-get update
sudo apt-get install hal
When HAL is installed type each line of the following and press enter at end of each line.
cd ~/.adobe/Flash_Player
rm -rf NativeCache AssetCache APSPrivateData2
If that doesn't work, you could install PlayOnLinux and try that.
Menu, System, Install Additional Software, PlayOnLinux. Then install Firefox and Flash through PlayOnLinux.