edit: I realize that Merlin and Frank are just dealing with a new operating system and are probably
not up for dropping $500+ for a new computer... but for those who are....
Too late for Frank I suppose but my recommendation is to go with
a mac mini.
You can use your same monitor and for $50 you install an app
called "Parallels" which lets you run Windows as an apple "app"
so you can still get at (your now re-installed) windows applications.
In my case that's limited to Microsoft Office and another program
(a few others if I want but haven't gotten around to reinstall)
IT WORKS VIRTUALLY FLAWLESSLY and believe me runs
*better* than my windows 7 laptop I use for work.
Then you get to stay on the reliable MAC system and
not deal with constant issues.
ping our grand master Bob D'Amico who set me down
this path of enlightenment