Hi,
Your system is malware free. FRST log shows me amount content of temp & junk files. We shall use TempFileCleaner to clean varius junk files as temp, cache&cookies.

Please download TFC by OldTimer to your desktop

[*]Please double-click TFC.exe to run it. (Note: If you are running on Vista, right-click on the file and choose Run As Administrator).
[*]It will close all programs when run, so make sure you have saved all your work before you begin.
[*]Click the Start button to begin the process. Depending on how often you clean temp
files, execution time should be anywhere from a few seconds to a minute
or two. Let it run uninterrupted to completion.
[*]Once it’s finished it should reboot your machine. If it does not, please manually reboot the machine yourself to ensure a complete clean.

----- Next -----

We shall remove all used tool in this topic with DelFix tool:

Please download DelFix by “Xplode” to your Desktop.

Run the tool and check the following boxes below;

[] Remove disinfection tools
[
] Create registry backup
[*] Purge System Restore

Now click on “Run” button. Wait for the programme completes his work.
All the tools we used should be gone.
Tool will create and open an log report (DelFix.txt)
Note: The report will also be stored on C:\DelFix.txt

----- Next -----

avast has been detected posible USB based malware.
We shall use MCShield tool to check & clean all USB based malware that uses an USB mem-device to expand to host system.

Check USB storage devices / removable drives

Download MCShield from one of the following links:

MyCity - Official download link
Softpedija - Mirror download link

[*] Double click MCShield-Setup to install the application.
[*] Wait a few seconds to MCShield finish initial scan.
Recommendation to under General and Scanner tab you click on Defaults button to choose recommended options.
[*] Connect your USB storage devices to the computer one at a time. Scanning will be done automatically.

When all scanning is done, you need to attach a logreport that MCShield has created.

Start → All Programs → MCShield → Logs

Attach here → AllScans.txt

Explanation: USB storage devices are all the USB devices that get their own partition letter at connecting to the PC,
e.g. flash drives (thumb/pen drives, USB sticks), external HDDs, MP3/MP4 players, digital cameras,
memory cards (SD cards, Sony Memory Stick, MultiMedia Cards etc.), some mobile phones, some GPS navigation devices etc.

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=> As for the other detected entries concern, they are legitimate.
CALMAIN.exe is related to Canon software. All detections in download folder you may just delete.

You may report them as FP.