Hi, I'm not very computer savvy and I think there may still be a trojan lurking somewhere on my computer. I would appreciate any help, thanks!

Lenovo with Vista
Intel(R) Core(TM) 2 Duo CPU T5250 @1.50GHz
32-bit operating system
Cable internet
(let me know if any more computer info is needed here)



So I had downloaded some stuff from rapidshare, and I virus scanned the .rar before I unzipped it. it was clean. I use AVIRA (version 10.0.0.567) and I had updated it in the morning before all of this virus chaos happened.

Next I downloaded an updated version (2.35.1219) of ccleaner and installed it, then did a ccleaner cleanup of my computer.

Then i did an AdAware (8.3.1) scan, and nothing was detected.

Continued using my computer. Shortly afterward, a popup notification box from Avira appeared, and it said the Guard detected something. I think I saw the word Trojan. There were two buttons I think - Remove, or Show Details . I clicked Details, thinking that i could see the details and then go right back to choose to remove the file. But nothing happened, the notification box went away, but I didn't get any details about the trojan or anything. I opened Avira, went to look at Events, and saw this:

Virus or unwanted program 'TR/Crypt.XPACK.Gen [trojan]'
detected in file 'C:\Windows\temp\SBS_LIBNSIS_TEMP_20100727200044.296_ 6.
Action performed: Allow access

Then I went to the "Guard" section of Avira. The "Last file found" = C:\Windows\temp\SBS_LIBNSIS_TEMP_20100727200044.296_ 6
And the "last virus or unwanted program found" = TR/Crypt.XPACK.Gen

So...I did a full Malwarebytes scan (I had to first update it, then I did the scan). It found nothing.
Then i did an Avira full scan, and it found 1 Warning but NO infected objects or viruses or anything, I can't even find that original trojan/infected temp file now, either! This was the warning Avira found:

warning: C:\Windows\winsxs\x86_microsoft-windows-naturallanguage6_31bf3856ad364e35_6.0.6001.22211_none_9e5aa34943e0a766\NlsLexicons000f.dll
[WARNING] 'Is the TR/Spy.5656576 Trojan'. This detection is probably an error. Please send us this file immediately for further analysis.

I send the file to Avira just now for analysis.

That is all I have done up to this point. I don't know if the ccleaner cleanup ended up deleting that original trojan file, but then why would the trojan be detected after the ccleaner scan was done?
I am worried that there is still a trojan lurking around on my computer, or something worse. I would appreciate any help offered!

Thank you very much, in advance!