Today I received the upgrade kit from Sony and upgraded my laptop from Vista Home Premium to Windows 7 Home Premium. I followed all the instructions specified in the included booklet but now it seems that Windows 7 takes ages to load, especially after the Welcome Screen. If I had to perform a Clean install, will this improve the performance and will I have problems to install the drivers (most probably I would need to use DVD 1 supplied with the upgrade kit). Any type of assistance is mostly appreciated.