That's good news,
Go here to learn how to show hidden files/folders:
http://www.xtra.co.nz/help/0,,4155-1916458,00.html#5
Re-hide after we are done
Let's scan this file:
D:\flashstart.exe
D:\start.exe run
Here:
http://virusscan.jotti.org/
copy/paste results back here please.
Run hijackthis and fix these:
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://uk.red.clientapps.yahoo.com/...arch.yahoo.com/
Nothing open but hijackthis and click fix checked
Also do this please:
Open Hijackthis.
Click the "Open the Misc Tools" section Button.
Click the "Open Uninstall Manager" Button.
Click the "Save list..." Button.
Save it to your desktop. Copy and paste the contents into your reply.
And a new HJT log plese.