Mathematica version 9.01 works very well an my Windows XP system.
Now, I have updated zu version 10 on a new Windows 7 system, 64bit,
same hardware: AMD Athlon(tm) II X2 245 Processor, 2900 MHz, 2 Kern., 4GB RAM
The starting process takes 80 seconds until the welcome screen.
In the meantime, I get the message: "Formatting Notebook Contents".
Next, I start a small nb-File, it is open immediately.
But, now I can insert only two letters ! Pr instead of PrimeQ[ ]
The systems freezes for about 40 seconds and in the headline appears
"No response", no input is possible ...
After the 40 seconds, Mathematica works well for a moment.
In the next cell, I can insert only two letters, waiting 40 seconds,
and so on.
I have deleted the Directory \ProgramData\Mathematica and
make a new activation - same result.
Kaspersky's Antivirus tells "no viruses",
Malwarebytes says "no malware".
I have installed Mathematica in the directory C:\math_Maa
Is ist possible, that this Underscore makes the problem?
Now, what can I do? I'm despaired. Thanks for any answer