I have a notebook, IBM Thinkpad R51, that runs XP Home.
Something went wrong with my notebook, the OS runs quite odd like the Isass.exe program (ctrl+alt+del, scroll down and find Isass.exe), at times a message box immerge by saying that something went wrong with the program and the computer needs to shut down.
So, I assume its the OS software problem. Probably virus or spyware, messing up the computer. I decided to install XP Pro on top of the XP Home.
The question is, should I format the notebook? Because my notebook has this IBM software that comes with the notebook. So I'm too afraid that I would lost it.
2ndly, if I install XP Pro, will there be 2 (two) OS's?
3rdly, will my odd problems solved?
I think I have more questions but my head right now isn't so rational at the moment

I post this one first. Thanks people for any help.