After reading through all 14 pages of this thread and trying all suggested hints, I still haven't cracked the nut, so to say (you'll understand what I mean after reading the rest; if someone finds the time to do so).

First infos on my system:

Regarding my system:
1. OS version? (Eg: Windows 98)
XP Pro SP2
2. What firewalls you have?
Windows built-in
3. How much ram?
1.024 GB
4. Hard Disk space available?
Drive C: 13.7 GB, Drive D: 9.27 GB (more or less)
5. Connection type? (Eg: dialup, broadband, cable, etc.)
ADSL 512kb/s - 256kb/s by TT&T Thailand
6. Modem & router brand name & model numbers?
King Com ADSL USB Modem - Conexant AccessRunner USB ADSL WAN Adapter
7. Where are you trying to connect from (home, school, work, etc.)?
from home
8. What version of Limewire (LW) & Java do you have? (Go to LW's menu Help>About LW...) Will show both LW & Java version.
LW 4.9.23 PRO, FW 4.9.37 & 4.9.10, Java 1.5.0_05 and 06 (I'm back at 06)
9. Who is your ISP provider? ( AOL/MSN/Comcast/Tiscal)
TT&T Max Net
10. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up.
Not sharing with anyone, though I've installed LW and FW, I never run both at the same time.

Besides those information, I've been running 'Peer Guardian 2' (disabled at the moment) and the Firewall from XP without any problems up until that crash. I regularily check my system with AVG Anti Virus, Ad-Aware, Spybot, Spy Sweeper, Bug Doctor and Error Doctor. Besides, I'm running the BOINC client with Einstein, Seti, Climate and LHC @home.

My LW setup:

Cable/Dsl
Disable Ultrapeer Capabilities: NOT checked (marked)
Enable OOB Searching: checked (marked)
Maximum D/L: 15
D/L Speed: 100%
Upload bandwidth: 20.12 KB/s
Uploads per person: 1
Max upload slots: 5
Listen on Port: 35248
Use UPnP: checked (marked)
Allow freeloaders: rarely

Tests I've been conducting following the suggestions here in this thread:
Speed Tests:

First Speed Test from 9.18 pm till 9.24 pm Bangkok time with LW open via http://www.speakeasy.net/speedtest/

Server SF/Ca = d/l 244 kbps - u/l 120 kbps ( d/l 30.5KB/s - u/l 15.0KB/s )
Server NY/ = d/l 267 kbps - u/l 111 kbps ( d/l 33.4KB/s - u/l 13.9KB/s )
Server Se/Wa = d/l 276 kbps - u/l 77 kbps ( d/l 34.5KB/s - u/l 9.6KB/s )
Server LA/Ca = d/l 309 kbps - u/l 91 kbps ( d/l 38.6KB/s - u/l 11.4KB/s )
Server Da/Tx = d/l 194 kbps - u/l 86 kbps ( d/l 24.3KB/s - u/l 10.8KB/s )
Server Chi/IL = d/l 331 kbps - u/l 106 kbps ( d/l 41.4KB/s - u/l 13.3KB/s )
Server Atl/Ga = d/l 308 kbps - u/l 106 kbps ( d/l 38.5KB/s - u/l 13.3KB/s )
Server Wa DC = d/l 251 kbps - u/l 109 kbps ( d/l 31.4KB/s - u/l 13.6KB/s )

Second Speed Test from 9.25 pm till 9.32 pm Bangkok time with LW closed and the same test side.

Server SF/Ca = d/l 423 kbps - u/l 197 kbps ( d/l 52.9KB/s - u/l 24.6KB/s )
Server NY/ = d/l 425 kbps - u/l 194 kbps ( d/l 53.1KB/s - u/l 24.3KB/s )
Server Se/Wa = d/l 422 kbps - u/l 197 kbps ( d/l 52.8KB/s - u/l 24.6KB/s )
Server LA/Ca = d/l 424 kbps - u/l 199 kbps ( d/l 53.0KB/s - u/l 24.9KB/s )
Server Da/Tx = d/l 426 kbps - u/l 196 kbps ( d/l 53.3KB/s - u/l 24.5KB/s )
Server Chi/IL = d/l 413 kbps - u/l 194 kbps ( d/l 51.6KB/s - u/l 24.3KB/s )
Server Atl/Ga = d/l 424 kbps - u/l 197 kbps ( d/l 53.0KB/s - u/l 24.6KB/s )
Server Wa DC = d/l 421 kbps - u/l 195 kbps ( d/l 52.6KB/s - u/l 24.4KB/s )

Since I am in the nothern part of Thailand, I decided to try some speed tests using Asian servers with LW closed. The first at 9.47 pm and the second at 9.51 pm

1st a Malaysian server via 'xpeedometer'.......result:
d/l 342 kbps/s (d/l 42KB/s) for 500KB size in 11.937 sec.

2nd an Indonisain server via http://www.mystarone.com/speedtest
.......result:
d/l 463 kbps/s (d/l 58.04KB/s) without infos regarding size and duration

To my present state of condition with opened LW at 10.10 pm:

23 movies in download queue with "need more source"
1 movie in download queue with "connecting......" (trying to connect)
8 movies in download queue connected to host(s)
- 1st movie with 5 hosts at 54% d/l speed 0 - 1KB/s
- 2nd movie with 3 hosts at 51% d/l speed 0 - 2KB/s
- 3rd movie with 3 hosts at 48% d/l speed 0 (without displaying remaining time)
- 4th movie with 2 hosts at 33% d/l speed 0 (with displaying remaining time)
- 5th movie with 4 hosts at 32% d/l speed 0 - 1KB/s
- 6th movie with 3 hosts at 30% d/l speed 2 KB/s
- 7th movie with 1 hosts at 23% d/l speed 0 (without displaying remaining time)
- 8th movie with 2 hosts at 20% d/l speed 0 (without displaying remaining time)

2 people are in the progress of uploading a movie from me. Both are using LW and the upload speed varies from 0 - 4 KB/s

Information from the lower part of the LW window:

poor connection (while writing all this my connection went up to "good connection")
globe without brickwall
77 files to share
d/l 9@0 - 10 KB/s (varies)
u/l 2@0 - 4 KB/s (varies)

Result of bug report conducted at 10.15 pm:

Receive Incoming Session : true

So, I first like to appologize if my information is so extensive, but I thought (following the advice of some moderators here) it would be better to give you to much than not enough.

My question is, as you can imagine, regarding the low d/l and u/l numbers. Any idea where I have to change something, or adjust, or tune, or whatsoever to get both numbers to an exceptable level ????

Besides, thanks for taking the time reading all this and all the other stuff we non-geeks ask you on a daily basis (specially me )

Okay, now it's already 24 hrs later (4-4 06) and my limewire shows:

9 files connected to 36 hosts (all-in-all) with a download rate fluctuating between 1-9 KB...........

Sometimes I feel like crying when I read some users' concerns in a drop of download speed from 50 KB to 30 KB