I installed, Ubuntu using windows installer in Windows 7 OS, will it create any problem, if I create partition of same drive.
No, it wont make any problems, and you are not really creating another partition.
I have both Linux and and 2 installs of Windows 7 (in both 32 and 64-bit versions) installed on my desktop.
The 32-bit version of Windows 7 shares the same physical drive as Linux, but obviously on different partitions. The Windows 7 64-bit version is installed on another drive.
For linux I have 3 partitions:
I use a utility by diskinternals to manipulate Linux files from within Windows 7.