i then used mbam.
Malwarebytes Anti-Malware (Trial) 1.65.1.1000
www.malwarebytes.orgDatabase version: v2012.11.02.09
Windows 7 Service Pack 1 x86 NTFS
Internet Explorer 9.0.8112.16421
Joyce :: JOYCE-PC [administrator]
Protection: Enabled
11/2/2012 10:00:09 AM
mbam-log-2012-11-02 (10-00-09).txt
Scan type: Quick scan
Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM
Scan options disabled: P2P
Objects scanned: 226087
Time elapsed: 33 minute(s), 55 second(s)
Memory Processes Detected: 0
(No malicious items detected)
Memory Modules Detected: 0
(No malicious items detected)
Registry Keys Detected: 1
HKLM\SOFTWARE\Wow6432Node\Google\Chrome\Extensions\mpfapcdfbbledbojijcbcclmlieaoogk (PUP.GamesPlayLab) -> Quarantined and deleted successfully.
Registry Values Detected: 0
(No malicious items detected)
Registry Data Items Detected: 0
(No malicious items detected)
Folders Detected: 0
(No malicious items detected)
Files Detected: 2
C:\Users\Joyce\AppData\Local\Temp\IWantThis.exe (Adware.GamePlayLabs) -> Quarantined and deleted successfully.
C:\Users\Joyce\AppData\Local\Temp\.exe (Trojan.Agent) -> Quarantined and deleted successfully.
(end)