It's because 4.5 is simply an update of 4.0, therefore in Plesk the version appears as 4.0 rather than 4.5
The actual long version number (4.0.30319.XXXX) in Plesk, shows it is in fact 4.5 as you can see from the versions list:
http://en.wikipedia.org/wiki/List_of_.NET_Framework_versions
The physical path to your account would be: C:\inetpub\vhosts\your_username\ Replace...
You can download WebMatrix for free: http://www.microsoft.com/web/webmatrix/
Remote database connections to MySQL/MSSQL are not supported on our shared/reseller hosting...
In your web.config file, add the following line of code to enable HTTP...
To modify PHP settings in Plesk: Websites & Domains --> Show Advanced Operations...