This is a disastrous thread because of refusal to heed the advice of those who knew it was going to go wrong from long experience.
The procedure when trying to construct a System Reserved partition (when there is good reason - for which there isn't here for reasons already given) is to mark it Active and run Startup Repair 3 times to write the System boot files onto the partition. This has been done hundreds of times here, whereas using EasyBCD to construct SysReserved is not a solution I ever recall us using, just as using PW Rebuild MBR won't do the job correctly since neither can enable the Repair console on F8 tools menu.
To rescue your Dual boot, Use your Windows 7 DVD Repair console or Repair CD: System Repair Disc - Create
. To not have prepared one for an experimental process is reckless.
If you cannot boot a disk, then write the DVD ISO to flash stick using UltraISO trial version: On File tab Open DVD or ISO, on Bootable Tab select Write Disk Image, Format, Write. Boot stick under USB, Removable or HD's.
Boot the DVD/CD preferably, or stick, or tap F8 key repeatedly at bootup to choose Repair My Computer, on first screen press Shift + F10 or click through to System Recovery Options
to open a Command Prompt, type:
SEL Disk 0 (confirm this is Windows 7 HD)
Sel Part 1 (confirm this is XP partition)
Now close Command Box, proceed to Second screen of Repair My Computer to check for Windows 7 installation, accept any offered Repair, if none offered click through to Recovery Tools list to run Startup Repair with reboots until Windows 7 starts.