Is the Acer Aspire Netbook? Got one of those also! :-)
See if you can do this:
Open Task Manager ( with 'Ctrl' 'Alt' 'Del' simultaneously)
Go to the Processes tab, and end exlporer.exe, if it's there.
Now, go back to File > New Task (Run)...
In the 'Open' field type (or copy/paste) this, exactly:
If not, restart the computer, and see if it works then.
If you hover your mouse at the bottom of the screen, does the TaskBar with the Start button reappear?
If it does, right-click on it, select 'Properties' and remove the tick beside "Auto-hide the task bar"
Retired - Doin' Dis, Dat, and slapping malware.