What kind of backup are you loading from? It looks to me like the problems are all related. They are probably related through the presence of a virus or a load of spyware...or both...which may be incorporated in the backup you're using. If so, using that backup just puts the problem right back on the drive.
Have you done a complete system scan with an up-to-date antivirus program? If you don't have one installed, there are free online scans at
Panda and
Housecall. Whatever AV software you use (installed on online), set it to clean whatever it finds.
If you haven't scanned for spyware, download, install,
immediately update and then run
Spybot and
Ad-Aware. I recommend you use them both since each tends to find things the other misses. Let them clean up any spyware found.