i've system with 4 GB Ram,250 GB HDD,Intel G33/G31 Express Chipset Fmily DISPLAY adaptor.
As per the AUTOCAD SUPORT instruction, i'v modified the boot.ini with 3 GB switch to create
XP Profile named as "Windows XP Professional 3 GB". I've been use this dual xP Profile.
For Revit2010, i've been using the 3GB XP Profile, it was working fine three days. Suddenly the 3GB Profile shows error while windos loading theProfile, After enters any username password
showing following Error:
"Windows cannot create a Temporary Profile.This might caused by Insufficient security previleges." Also the system is HANGING whenver i tried with 3 GB Profile. So ive to mnually shutdon, after i power on system CHKDSK is running in E drive and C drive. I've set the Virtual memory in E drive as 8 GB for this system has 4 GB as Physical memory. Even i changed the virtual memory location to F drive which has enough free space, the 3 GB xp Profile.

could yoy anyone working on this ISSUE and revert back. Thanks have a nice day.

Sorry, no quick answer.
Earlier I had read through the material from MS about the 3GB switch as it applies to XP. I cane to my private conclusion that MS does not wish to give much support to this feature.

Have you checked in at the AutoDesk Forums ? ?
Perhaps someone there has found a solution...