That temp file is possibly a trojan downloader family member. Use
CCleaner and set it to delete all temp files without waiting for the specified time before running it.
There's a tutorial and explanation of IE-SpyAD [highlight]
here[/highlight] and the application itself should be downloaded from it's [highlight]
new residence[/highlight] at SpywareWarrior. I'll update all links to it now!
The most popular Zip program has to be [highlight]
WinZip[/highlight]. Although it's never been freeware, the shareware version has, up until now at least, never expired and always remained useable.
To archive files, either use it's GUI or the Windows Explorer right click context menu, where, after installation you'll see a Winzip "group" entry. In the attached example, aspi.log is being added to the currently empty aspi.zip archive. You would do the same with hijackthis.log and then attach hijackthis.zip to your post.
[highlight]
WinRaR[/highlight] is also a very useful archiving tool which is compatible with Winzip. Again' it's available as a shareware product that, to my knowledge, never expires.
The free open source 7Zip is available [highlight]
here[/highlight] but it's default is not wholly compatible with Winzip.