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I administrator alot of PCs for my work and yes I could probably sit down and remove alot of the problems they've acquired over the years but sometimes its just easier to start fresh.

i most of the time im doing it yearly

Windows 7 is so freak'n stable it is no joke. I have to say it is the only windows operating system that I have never had to reinstall (well... except for NT 3.1) Most cleaning solutions go a long way (MSE, CCleaner, Spybot S&D, MalwareBytes, and I like ESET Internet Security). I recently (about a year ago) updated a system from an AMD 780g chip set to a 890fx chipset and my Windows 7 install corrected itself like a champ until I was able to install the newest drivers. Windows 7 really has made the OS reinstall a much less likely thing as opposed to the past.

Times reinstalling win95/98 many times. Causes for reinstall: slowdowns, vira, hdd crash
Times reinstalling win2k/winxp some times. Causes for reinstall: slowdowns, hdd crash/raid problem
Times reinstalling vista: 1-2. Causes: crappy drivers/faulty antivirus
Times reinstalling win7: none

You can save yourself a lot of reinstalls with common sense and preventing many services/programs from starting up automatically (services.msc, regedit.exe, taskschd.msc - most should get by with msconfig). And make sure your SSD's firmware is updated.

Don't forget fileshredder in the spybot program.

I just re-installed Win 7 after a nightmare experience with Win 8. Most games hide the saves in a hidden directory called c:/Users/your Name/AppData/local/ so make sure you back this up as most back-up programs miss hidden directories.

Please, admin may you correct the image below? Just edit it to a url format. I posted the comment but can not find the edit button.

Registering.....

I agree with xplaur. Everytime my system is slow (hard) or too many games installed, I prefer to reinstall windows. Just 3~4h and the system is usable again. And gets really fast with a fresh install.

Everytime I reinstall, I make a new dir with a backup that contains files from the last reinstall.

Just my example. In 2 and half years, 11 reinstall. I just think that reinstall is easier than clean old files.

Ahhh last reinstall lasted 9 months. Look that I do not use UAC and any anti virus. And still, http://hijackthis.de/ showed a clean PC. But I like in couple of months to reinstal everything.

bye

Since I don't have any programs I usually resinstall Win7 just to get rid of the stuff I don't need. Besides that I use CCleaner, Malwarebytes together with Comodo Internet Security 5.12 and that's it.

Yes, it ca be a pain in the ass if.....
...... you keep a 200Gb+ single OS partition and store all your personal files into the dedicated, by default, directories like my docs, my music, my videos, etc....
..... you are a professional and you have tons of dedicated software, plugins, codecs, custom configs, etc......
....if not, you have no excuse!

Yes, I install OS every time I have {too many) codecs problems/conflicts, registry or corrupt OS files, installing or reinstalling chronic problems. No, I don't use and I don't recommend registry cleaner, system optimizer or tweaking software. So many times I've seen OS acting like a cardiac failure patient, after cleaning the registry, repairing the corrupted files or eliminating the viruses. Even updating the drivers sometimes is way worst than fresh install.

My 0,0000002 cents.....

But if I Change the motherboard but everything else the same?

I reinstaled windows when I instaled the wrong version (32 bit), I needed 64 bit version.

I use to re-install Windows all the times in one year or less it isn't a pain for me to do so as I used different back up program to help me take less time or fresh install of Windows but of course some people can't go through those hassle over and over again !!!