Summary: It's often desirable to have a comprehensive list of all the hardware and software installed on your machine. Belarc Advisor is the way to get it.
Is there a way or a tool to tell me what the computer's specs are?
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Indeed there is.
There are various tools, including Windows itself, that will report on various aspects of your computers configuration. Most focus on one or two specific aspects, though, and make it difficult to form a picture of your computer as a whole.
Belarc Advisor is a PC auditing program that examines your computer and produces a one-page report of all the hardware and software installed on it.
A very comprehensive report.
Here's an image of just a portion of the report on my desktop machine:
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The report goes on to include all Users, Printers, Displays, Network adapters and other hardware, as well as listing all installed software, licenses (including product keys) and hotfixes.
It's an impressive list.
Belarc Advisor also
provides a level of evaluation, letting you know whether or not you are
up to date on security fixes and the state of your virus protection.
There's also an exhaustive benchmark of your overall security status.
(Quite frankly this last is overkill for the average user, but
highlights many additional things that can be done to "lock down" a
system to be used in a security conscious environment. Here at home, I
failed this benchmark. 
)
Belarc Advisor is free for personal use, and a great utility for auditing and recording your comprehensive system state.
I recommend it.
Related:
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How do I find out what's installed on my machine? Programs can be installed in many ways and many places. There's no single authoritative list of what's installed, but we can get close.
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Shovelware: What do I do with all this extra software on my new machine? Shovelware - lots of extra software you didn't ask for - appears on almost every new machine these days. I look at why shovelware exists, and what you might want to do about it.
Article C3526 - October 10, 2008
I've used this utility for years now - I LOVE IT!
Posted by: Carl R. Goodwin at October 14, 2008 9:00 PMAlthough Belarc is a very good program which I use for overall viewing, I would also recommend SIW (System Information for Windows - SIW). It gets a tad more in depth with your system hardware and software. http://www.gtopala.com/
Everest would be another good benchmarking program.http://www.lavalys.com/
Posted by: Linda Claycomb at January 13, 2009 1:16 PMAida32 is another VERY comprehensive professional system information, diagnostics and benchmarking program running on Win32 platforms. It extracts details of all components of the PC. It can display information on the screen, print it, or save it to file in various formats like HTML, CSV or XML. It's gotta be one of the top 5 most useful utilities ever. Oh, and it's free.
• full hardware & software information on 80 pages
• built-in hardware database: detailed information about 22000 components
• physical information for CPU, motherboard, hard disk, optical drives, motherboard chipset, buses, sensor information, installed programs, event logs list
• diagnostics module to reveal possible problems
• memory benchmark
and much more.
Posted by: Paul Masters at January 13, 2009 4:18 PMthis belarc advisor is great. told me everything i didnt have a clue about re. my pc. its great and so far ill be keeping it. im glad i saw it mentioned. regards and thanx
Posted by: paul redfern at July 8, 2009 12:37 AMI jsut used belarc to see my winxp COA code.. and it seems that the one listed by the program is infact not my product key and isn't a valid code..... Hmmm weird, guess I'm glad I didn't loose the original
Posted by: Mike at October 6, 2009 10:01 AM