Cannot Open Demo Account on some MT4 Platforms

I have recently posted, than I am unable to loggin in my MT4 Demoaccount from Varengold - now I tried to download the MT4 from MbTrading and experience, that I am not even able to create an Account on this Demo MT4

so it is NOT an isolated Broker MT4 Problem

forgot to mention, that some Weeks ago, my Computer expereinced a Hardware Problem and did a Windows Hardware Check on "C" and Defragmentation

what Configuration on my PC could prevent me from doing this?

thanks for any Suggestion

Cheers

by the way:

how to locate and delete former MT4 Platform?
some are easy tolocate in the Programm Files - some not

just gor this error warning

urekaLog 6.0.22

Application:
----------------------------------------------------------------
1.1 Start Date : Fri, 23 Mar 2012 12:52:02 +0700
1.2 Name/Description: stdcall_ChartPatterns.dll - (MetaTrader)
1.3 Version Number : 4.0.0.409
1.4 Parameters :
1.5 Compilation Date: Mon, 13 Jun 2011 17:22:25 +0700
1.6 Up Time : 56 minutes, 41 seconds

Exception:
---------------------------------------------------------------------------------------------------------------------------
2.1 Date : Fri, 23 Mar 2012 13:48:43 +0700
2.2 Address : 04FF1F68
2.3 Module Name : stdcall_ChartPatterns.dll
2.4 Module Version:
2.5 Type : EAccessViolation
2.6 Message : Access violation at address 04FF1F68 in module 'stdcall_ChartPatterns.dll'. Read of address 6F006EFC.
2.7 ID : 7C20
2.8 Count : 1
2.9 Status : New
2.10 Note :

User:
-------------------------------------------------------
3.1 ID : WorkStationV
3.2 Name : WorkStationV
3.3 Email :
3.4 Company :
3.5 Privileges: SeShutdownPrivilege - OFF
SeChangeNotifyPrivilege - ON
SeUndockPrivilege - OFF
SeIncreaseWorkingSetPrivilege - OFF
SeTimeZonePrivilege - OFF

Active Controls:
------------------------------------------------------------------
4.1 Form Class : MetaQuotes::MetaTrader::4.00
4.2 Form Text : 39003: MetaTrader - ActivTrades - [GBPUSD,H1]
4.3 Control Class:
4.4 Control Text :

Computer:
-------------------------------------------------------------------------------------
5.1 Name : WORKSTATIONV-PC
5.2 Total Memory : 12199 Mb
5.3 Free Memory : 4594 Mb
5.4 Total Disk : 256 Gb
5.5 Free Disk : 176,66 Gb
5.6 System Up Time: 2 days, 38 minutes, 6 seconds
5.7 Processor : Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
5.8 Display Mode : 1600 x 900, 32 bit
5.9 Display DPI : 96
5.10 Video Card : Intel(R) HD Graphics Family (driver 8.15.10.2291 - RAM 1811 MB)
5.11 Printer : Canon MP280 series Printer (driver 2.41.2.10)

Operating System:
--------------------------------------------
6.1 Type : Microsoft Windows 7 (64 bit)
6.2 Build # : 7601
6.3 Update : Service Pack 1
6.4 Language: German
6.5 Charset : 0

naybody has an explanation?