Try doing this:
You can repair Windows AntiSpyware using Add or Remove Programs in Control
Panel. Click Microsoft AntiSpyware and click Change. Click Next, and then
click Update.
Restoring Quarantined Programs
If you have accidentally quarantined a program, you can
remove it from quarantine and restore it to its original
state.
How to restore a quarantined item
1. From the main screen, or any of the screens with the
toolbar, click Spyware Scan (this is the product icon).
2. On the top right of the screen under the Take me to...
section, select Spyware Quarantine.
3. A list of all items in your quarantine is displayed.
Select the item you would like to un-quarantine and when
the item appears in the right details window, select Un-
quarantine Threat. This restores the item to its original
state before it was quarantined.
4. To un-quarantine multiple items in the quarantine,
select each item and click Un-quarantine All Checked
Threats at the bottom of the screen.
5. After you un-quarantine an item you should restart your
computer to make sure the restored application runs.
Windows AntiSpyware may prompt you to remove some peer-to-peer (P2P) file
sharing programs. If you choose to remove such a program, Microsoft Windows
AntiSpyware deletes the entire contents of the Program Files directory that
relates to the P2P program. Because some P2P programs store downloaded files
in a default directory under Program Files, this might remove all files
downloaded through the file-sharing program. For example, KaZaA stores .exe
and .dll files at C:\Program Files\Kazaa. Downloaded files are stored at
C:\Program Files\Kazaa\My Shared Folder. If you use Windows AntiSpyware to
remove KaZaA, all files and folders under C:\Program Files\Kazaa are
removed. If you have installed any P2P file sharing programs, we recommend
that you make a backup copy of your downloaded files before running Windows
AntiSpyware.
