You may try the following steps to see if it helps:
a) Try to run devenv /ResetSettings (in command prompt) to eliminate the related potential settings problem.
b) Try disabling Add-ins (e.g. "Tools" | "Add-in Manager") or run "devenv.exe /SafeMode".This can eliminate the possibility that third party Add-ins or packages are causing problems. (For more detailed VS command line switches information, see: http://msdn2.microsoft.com/en-us/library/xee0c8y7.aspx )
c) Try creating a new project. Sometimes corrupted project settings can cause problems. These are project specific.
d) Try to reboot the operating system to safe mode. This can help to isolate whether any other applications are interfering with Visual Studio. Note that some features (like IIS) are not available under safe mode. Please check whether this can be applied or not. In addition to safe mode, we can also try "clean boot": How to configure Windows XP to start in a "clean boot" state http://support.microsoft.com/kb/310353 .
e) Try to create a new user account. This can help isolate user profile corruption related causes.
In addition, Microsoft Visual Studio 2010 Ultimate RC has been released, you could get it from here: