You can use free Regmon utility from http://www.sysinternals.com/ntw2k/source/regmon.shtml to monitor registry access during txt2pdf install.

>I searched registry for 'txt2pdf' using regedit and it didn't find it. I guess, I may want to add a search on the hard drive.
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>Thanks.
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>>>It's installed in c:\Program Files\Text2PDF. In my program I just check, if this file is present there and if not, display a message to download that program. However, what if a user installed it to other location?
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>>If it doesn't create registry entries that point to its location, than you've only two choices:
>>1. Search all local HDs
>>2. Ask user about location
>>
>>In either case you'll have to remember it's location so you wouldn't ask about it in the future.