There is a FREE patch that can solve the problem of a slow browser when MediaGet (or any other download manager) is active.
The patch supports Windows XP SP1(x64)/SP2(x86,x64)/SP3, Vista without SP(x86,x64), Vista with SP1(x86,x64), 7 beta(x86,x64).
The patch allows removing the concurrent half-open outbound TCP connections limit which was introduced by Microsoft in Windows XP SP2 and then removed in Windows Vista SP2 and further versions. The final version of Windows 7 doesn’t have this problem.
More details at the application see on homepage
In case of any error you can restore the default settings. Press ‘Restore original file’ for that
Installation of Half-open limit fix:
1) Run Half-open limit fix
2) Select a new concurrent half-open outbound TCP connections limit and press ‘Add to tcpip.sys’ (100 connection limit is enough for most users).
3) Restart your computer and enjoy the performance.
You may have to restart Half-open limit fix after Windows update or installing the Service Pack as Microsoft sometimes replaces the old tcpip.sys file with a new one.