Here's a few free geeky tools I if you ever run into hassle, some of which need no install:
Stinger
StartupList
Avast Virus Removal Tool
Dr. Delete
Process Explorer
Unlocker
Malwarebytes
There's a plethora of others. Enjoy.
Any more gems like these, BTW Malwarebytes Rocks!
There's plenty. I have a myriad of geeky programs that I use. I've been somewhat self-employed doing freelance computer repair since I was about 14. I recommend anything by Merijn Bellekom. Brilliant guy.
http://75.127.110.25/~merijn/forums.php
Advanced SystemCare Free v3 - While not my favorite, I suppose it works for some.
BitDefender's FREE Online Scan is pretty paranoid.
Spyware Terminator is reasonably solid.
Driver Cleaner Pro for getting rid of pesky remnants of ATI/Nvidia/etc software.
WinMTR for diagnosing some connectivity issues.
SG TCP Optimizer for a user friendly/GUI based network tweaker.
Spybot Search & Destroy - hate the system protection plug-in, but for all intents and purposes, a good, robust program.
MVPs Host File for blocking unwanted ads. Does a good job. Don't recommend using this on comps with slow internet or processors. Can create quite a bit of lag when opening up browsers.
CCleaner for getting rid of temp files and various history. Great if you look at a lot of porn and don't want the better half to find out.
CPU-Z for various inquiries about CPU/motherboard/memory.
GPU-Z for video card information.
Memset and CPU-Tweaker are neat "power user" tools for pretty nifty memory/CPU control.
HijackThis which was a Merijn Bellekom program, until he sold it.
Launchy which is really freaking cool.
7zip is a great free compression agent.
Avoid
most all "RAM CLEANER - MAKE UR COMPUTER RUN LIKE R2D2 ON SPEED!!!11111~1!!`tab" programs like the plague.