WEI error

I just installed Windows 7 Ultimate, and installed various drivers, but I can not classify my computer with Windows Experince Index. When I press: Classify this computer, writes:

"Windows experince index of the system could not be calculated.
The assessment, requested can not be completed. This computer does not have the necessary multimedia support to run the assessment which was requested "

Is there any driver kerfuffle that come into play? I have installed chipset and graphics drivers!

It was no problem when i had Vista installed.

Other stuff?

My computer: Acer Aspire 5738ZG

Intel Pentium T4200 (2.0 GHz, 800Mhz FSB)

Nvidia GeForce G105M - 512MB

500GB HDD (5200 RPM - I think)

My WinSat log says:

18775203 (1852) - winsat\logging.cpp:0815: --- START 2009\11\15 22:54:37 ---
18775203 (1852) - winsat\main.cpp:2861: > no need to restore power state (no saver object).
18775203 (1852) - winsat\main.cpp:2873: > Not necessary to reenable EMD cache.
18775203 (1852) - winsat\main.cpp:4909: > exit value = 4.

18787871 (3760) - winsat\logging.cpp:0815: --- START 2009\11\15 22:54:50 ---
18787886 (3760) - winsat\main.cpp:4301: Command Line = "C:\Windows\system32\winsat.exe" formal -cancelevent 1d2d0c85-96ba-4db7-858f-cefa54eb67f6
18787886 (3760) - winsat\processwinsaterror.cpp:0095: ERROR: tried to read resource strings, unknown exception occured
18788245 (3760) - winsat\main.cpp:4474: > IsFormal=TRUE  IsMoobe=FALSE.
18788245 (3760) - winsat\main.cpp:4505: ERROR: no multi-media files, no MM support
18788245 (3760) - winsat\main.cpp:2861: > no need to restore power state (no saver object).
18788245 (3760) - winsat\main.cpp:2873: > Not necessary to reenable EMD cache.
18788245 (3760) - winsat\main.cpp:4909: > exit value = 10.

18825171 (3548) - winsat\logging.cpp:0815: --- START 2009\11\15 22:55:27 ---
18825171 (3548) - winsat\main.cpp:4301: Command Line = "C:\Windows\system32\winsat.exe" formal -restart clean -cancelevent 1c9b66f1-e2f1-4503-b4f0-2dc86f2be488
18825186 (3548) - winsat\processwinsaterror.cpp:0095: ERROR: tried to read resource strings, unknown exception occured
18825373 (3548) - winsat\main.cpp:4474: > IsFormal=TRUE  IsMoobe=FALSE.
18825373 (3548) - winsat\main.cpp:4505: ERROR: no multi-media files, no MM support
18825373 (3548) - winsat\main.cpp:2861: > no need to restore power state (no saver object).
18825373 (3548) - winsat\main.cpp:2873: > Not necessary to reenable EMD cache.
18825373 (3548) - winsat\main.cpp:4909: > exit value = 10.

19245687 (2288) - winsat\logging.cpp:0815: --- START 2009\11\15 23:02:27 ---
19245687 (2288) - winsat\main.cpp:4301: Command Line = winsat  formal -v
19245687 (2288) - winsat\processwinsaterror.cpp:0095: ERROR: tried to read resource strings, unknown exception occured
19245890 (2288) - winsat\main.cpp:4474: > IsFormal=TRUE  IsMoobe=FALSE.
19245890 (2288) - winsat\main.cpp:4505: ERROR: no multi-media files, no MM support
19245905 (2288) - winsat\main.cpp:2861: > no need to restore power state (no saver object).
19245905 (2288) - winsat\main.cpp:2873: > Not necessary to reenable EMD cache.
19245905 (2288) - winsat\main.cpp:4909: > exit value = 10.

20014647 (1444) - winsat\logging.cpp:0815: --- START 2009\11\15 23:15:16 ---
20014663 (1444) - winsat\main.cpp:2861: > no need to restore power state (no saver object).
20014663 (1444) - winsat\main.cpp:2873: > Not necessary to reenable EMD cache.
20014663 (1444) - winsat\main.cpp:4909: > exit value = 4.

78902887 (0844) - winsat\logging.cpp:0815: --- START 2009\11\17 15:55:16 ---
78902981 (0844) - winsat\main.cpp:4301: Command Line = C:\Windows\system32\winsat.exe formal -log -cancelevent 43cd3916-4633-4c36-9944-efbd362798b0
78902981 (0844) - winsat\processwinsaterror.cpp:0095: ERROR: tried to read resource strings, unknown exception occured
78903418 (0844) - winsat\main.cpp:4474: > IsFormal=TRUE  IsMoobe=FALSE.
78903418 (0844) - winsat\main.cpp:4505: ERROR: no multi-media files, no MM support
78903418 (0844) - winsat\main.cpp:2861: > no need to restore power state (no saver object).
78903418 (0844) - winsat\main.cpp:2873: > Not necessary to reenable EMD cache.
78903418 (0844) - winsat\main.cpp:4909: > exit value = 10.

136516 (4092) - winsat\logging.cpp:0815: --- START 2009\11\22 16:02:24 ---
136532 (4092) - winsat\main.cpp:4301: Command Line = "C:\Windows\system32\winsat.exe" formal -cancelevent cac9a2ae-14d3-4e55-8c44-ca197ac362fb
136547 (4092) - winsat\processwinsaterror.cpp:0095: ERROR: tried to read resource strings, unknown exception occured
136984 (4092) - winsat\main.cpp:4474: > IsFormal=TRUE  IsMoobe=FALSE.
136984 (4092) - winsat\main.cpp:4505: ERROR: no multi-media files, no MM support
136984 (4092) - winsat\main.cpp:2861: > no need to restore power state (no saver object).
137000 (4092) - winsat\main.cpp:2873: > Not necessary to reenable EMD cache.
137000 (4092) - winsat\main.cpp:4909: > exit value = 10.