You've a PC, run updates, Antivirus, AdAware, to keep spyware off etc, so they run properly.
You have to clean up those computers on a daily / weekly basis.
They do save files, internet pages, cookies etc & become slow, corrupt ...
How often PCs get corrupted due to virus or spyware etc ... !

Sounds familiar !
Do you want a permanent, one time solution, a new PC everytime ?

Unbelievable ?       NO.
    Certainly you will like it.
    I have at my PC, few friends computers, now have NOTHING to worry ...

Here is some info:
    - According to Bill Gates, 5% of Windows machines crash on average, twice daily,
       so we have 70 million crashes every 24 hours.
    - 95% PCs infected with Virus, new strains of worms and bots forage for unpatched PCs.
    - More than 20 Million people have Spyware installed ...

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For more info click ODV Stable Computing Solution info