my first question

is it ok to use my sony magic memory stick from gamestop or do I need a backup stick? after I make the MMS and flash my psp will I be able to simply format this stick and use it just as a normal one again?

second
http://forums.dashhacks.com/f133/the...9/#post1084297

following that guide
step 4 & 5

4) In the Rain's Simple MMS Maker window, tick the "Format Memory Stick" box, then click Make MMS

5) You should now be prompted to find the 5.00 Official Eboot. It should be in the same directory as RainUltraLiteMMS.exe

I check mark that box but nothing pops up or prompts me, I have the right drive selected