For the backup:
The people who repaired your computer might have placed all your backed up files in a folder on your hard drive. Look through your hard drive to see if you can find any of the backed up files. If not, call them and ask where they placed all of the backed up data.

For your speakers:
Double check to make sure your speakers are correctly powered and plugged into the correct plug on your computer. (Also, try plugging the speakers into another computer, if you have one handy, to make sure the speakers work.)

For AIM:
Many programs could be considered "Spyware" since they gather some form of information from your computer and report it back to the parent company. Instead of using AIM, I would suggest downloading the program called GAIM. GAIM is a 3rd party chat program that works exactly like AIM (it allows you to use your AIM screen names) but its a lot better, and safer, and has better features.
http://gaim.sourceforge.net/downloads.php

As for the blurry screen:
Make sure your monitor cable is securely connected to your computer. Try updating your video drivers to the latest version.

If these solutions don't work, please do the following (to help us figure out what is wrong):
- Go to Start -> Run and run "dxdiag"
- Click the "Save all Information" button to save your computer info to a text file
- Attach the text file to this topic

I hope at least some of this helps.