Black screen in "Heroes 3"...(topic for "lag" issues in WoG)

I have a problem: after installing WoG (the latest version available), it worked stably for a while, but then it started to "freeze": during some transitions between actions (a centaur is attacking someone, etc.) and screens, the game freezes to a "black screen" – only the game cursor is visible, and that's it... The ENTIRE SCREEN IS BLACK! This problem also appeared in "Armageddon's Blade" (the same thing happens in the backup copy)... WHAT SHOULD I DO?! I'm already fed up! :(:(:(:(:(:(:(:(:(:(:: :smile33: :smile33: :smile33: :smile33: :smile33: :smile33: :smile33: :smile33: :smile33: :smile33: :smile33: :smile33:

Please advise what to do! :smile41:

P.S.: I can't reinstall the game – I don't have the disk... :smile05:

P.P.S.: Here are the "insides" of my campaign... don't be scared – I'm going to modernize it...
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DirectX

Version 9.0c
d3dx9_27.dll Yes

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Display devices

Device NVIDIA GeForce4 MX 440 with AGP8X
TnL Yes
Pixel shader 0.0
Vertex shader 0.0
Driver nv4_disp.dll
Version 6.14.10.9597
VendorId 4318
DeviceId 385
Memory 64.0 MB
Device NVIDIA GeForce4 MX 440 with AGP8X
TnL Yes
Pixel shader 0.0
Vertex shader 0.0
Driver nv4_disp.dll
Version 6.14.10.9597
VendorId 4318
DeviceId 385
Memory 64.0 MB

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Sound devices

Device C-Media Wave Device
Driver cmuda.sys
Version 5.12.0001.0050

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CPU

Device Intel(R) Celeron(R) CPU 2.40GHz, ~2.4GHz
Total 1
Speed 2389 MHz
MMX Yes
SSE Yes
SSE2 Yes
3DNow No

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RAM

Total 256 MB

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Operating system

Name Windows XP
Version Service Pack 1

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Drives

Name C:
Device ST380011A
File system FAT32
Total 22886 MB
Available 6405 MB

Name D:
Device ST380011A
File system FAT32
Total 53406 MB
Available 5850 MB

Name E:
Device SONY DVD-ROM DDU1612

Name G:
Device WS7611P KUO824T SCSI CdRom Device