I'm with ID, MsUther- I'd suggest doing a manual virus scan, after making sure your antivirus is updated.

Then a complete spyware scan, with two different spyware programs- you have to do this stuff manually, not rely on the PC to do it by itself.

This is the formulae I followed to wipe out a nasty Trojan on my PC.
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FIRST
Download Ad-Aware.

Use the: "Check for Updates Now" option and
download the latest reference files.

Use the Start button, and on the next window,
select: Perform Full System Scan.

Press Next, and let Ad-aware scan the hard drive

When finished, right-click the window with the
entries, choose: Select All from the menu, and
click Next.

Once AdAware has removed the entries, close the
program.
Restart your computer.


NEXT
Dowload the latest version of Spybot 1.4.


Check it for updates.

Run the program and have it fix anything it
finds in Red.

Restart your computer.


NEXT
Update your Anti Virus! Run when listed below.

NEXT
Reboot to safe mode.

Delete the entire contents of the below Temp
folders, but not the TEMP folder itself.

Remove all the files and sub-folders from the
below TEMP Folders:

C:\Documents and Settings\ \Local Settings\Temp
C:\temp
C:\windows\temp


The TIF ( Temporary Internet Files) can also be
emptied via:
Internet Explorer--Tools--Internet
Options--General tab--"Delete Files". Also tick
the "delete all offline content" box .

Clean out your Recycle Bin


NEXT

Run a full system scan with your Anti Virus.

Run a scan with Ad-aware. Have it fix anything
it finds.

Run a scan with Spybot. Again have it fix
anything it finds.


If the folder is still there, right click on it, & click 'properties' that should show if there's any hidden files. You can change the settings to 'show all files' in 'view' or something on My Computer.

If your antivirus isn't running, it should be easy to go into it's properties & see what it's set for.

Good luck- it may not work, but doing a virus & spyware scan is never a bad idea, I do a spyware every day & a full virus scan usually once a week.


Tojo