XP/7 computer how to reinstall XP without loosing dual boot?

[oqvist]

I googled for 30 minutes but it failed

You always loose dual booting when you reformat XP which is on my primary disk C.

What is the correct way of reinstalling it. I would like to reformat to get rid of all ev crap in there but I don´t want to spend hours getting 7 running again as well having to reinstall that as well as I generally have to.

Is there some application after reinstall that will reenable the 7 as an option for booting?

 

[jeremyshaw]

http://www.vistabootpro.org/

but... it's a freaken paid app. I just bit my tounge and reinstalled, anyways. Just XP takes almost an hour to install, compared to... 15 min for Win7?

EDIT: it's all because Vista/7 no longer use the boot.ini file, but another (actually, IIRC, it's the WinPE loader also used to install Vista/7) bootloader that is harder to modify.

 

[oqvist]

ouch... I forgot to mention I have Vista on a separate harddrive if that make things easier?

 

[ilkhan]

install XP, insert win7 disc, repair bootloader.

 

[oqvist]

Thanks! I reinstalled XP tried vista boot pro just to find it doesn´t work in XP .

how do I repair boot loader? I tried the repair start up option at the top. Now it sees my installation but I still don´t get to choose it when booting up. Hope I didn´t mess up since I accidently used an older version of 7 to repair. I am using the RC btw.