Good unpacker for newbie?

Okay, I'm new to trying unpaking, I tried the Generic unpacker W32, but that doesn't seem to function on my XP pro system, it wont even open properly, I just get a grey box, so I installed Procdump, which looks good I thought, but first program I unpacked, when I tried then opening it in Olly, it then gives me the message "the procedure entry point could not be located in the dynamic link library WINMM.DLL", it looks pretty straightforward what you are supposed to do, seems to do all the work for you, but somehow it didn't work.
Should I use a different unpacker, if so what?

[mtw]

You should goto the win tutoral forum and read some
of those posts. Dumping a protected app manually is
more that just running a dumper, you have to stop the
app at the oep and rebuild the iat if needed, some needs
some memory locations corrected, etc, etc

Read all the tutorals you can get, the more you read the
more you will understand the concepts of the protectors.

I see, I thought the idea of Procdump was to automate the proccess, I guess I have got some reading to do.

Actually, the manual unpacking tutorials at this forum are very good, I followed 4 of them today when I had a few hours to spare, and managed to complete all of them okay, using either Olly dump, or a combination of that and Imprec and Lordpe, also used Peid to find some OEP's, it is really seeming a whole less complicated now.