PowerQuest PartitionMagic 7.0

I wanted to partition my 64-bit machine using win xp x64 using this software but after re-allocating the space for C drive, it asks me to restart the machine after which it does nothing!

is it some issue with startup registry entries that it might be making which makes it incompatible?

any help will be appreciated,
with regards,
Ashish.

PM7 (or any other Symantec product for that matter) is not 64bit compatible which is why you have problems. Looks like a format and reinstall is in order.
From Symantec:

"Consumer product compatibility with 64-bit processors

Situation:
This page tells you about Symantec consumer products compatible with 64-bit processors

Solution:
Current consumer products have not been tested with 64-bit processors. For information on which operating systems are supported, please read
Compatibility of Symantec consumer products with Microsoft Windows 95/98/Me and Windows NT/2000/
"

Acronis Disk Director Suite has support for 64bit windows, and it works way better than norton!
http://www.acronis.com/enterprise/products/diskdirectorsuite/