Computer disconnects from Cable Modem

We have two identical computers. One of them disconnects from the cable modem. We have two different cable modems and I've tried them both and I get the same reaction. Having watched the lights on the cable modem, it showing me that the cable modem is not disconnecting. I've switched USB cables to see if that'll help recently, so I don't know. When the Cable Modem/Network closes out, it restarts within 1 to 5 seconds inconsistently.






Computer:
Operating System Microsoft Windows XP Home Edition
OS Service Pack Service Pack 2
Internet Explorer 6.0.2900.2180

Motherboard:
CPU Type Intel Celeron II, 900 MHz (9 x 100)
Motherboard Name TriGem eMachines Imperial/Glendale
Motherboard Chipset Intel Whitney i810
System Memory 128 MB (PC133 SDRAM)
BIOS Type Phoenix (08/31/01)
Communication Port Communications Port (COM1)
Communication Port Printer Port (LPT1)

Display:
Video Adapter Intel(R) 82810 Graphics Controller (4 MB)
3D Accelerator Intel i752
Monitor Plug and Play Monitor [NoDB] (1135117629)
Monitor Intel(r) AIM External TV Encoder Driver 4 [NoDB] (1135117629)

Multimedia:
Audio Adapter Intel 82801AA I/O Controller Hub - AC'97 Audio Adapter

Storage:
Floppy Drive Floppy disk drive
Disk Drive ST320410A (20 GB, 5400 RPM, Ultra-ATA/100)
Optical Drive IDE-CD R/RW 24x12A

Partitions:
C: (NTFS) 19085 MB (14286 MB free)

Input:
Keyboard Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse PS/2 Compatible Mouse

Network:
Primary IP Address 68.232.244.240
Primary MAC Address 00-12-C9-12-26-A9
Network Adapter Motorola SURFboard SB5100 USB Cable Modem (68.232.244.240)
Modem HSP56 MR

Peripherals:
Printer Fax
Printer hp psc 1200 series
USB Device Generic USB Hub
USB Device hp psc 1200 series
USB Device Motorola SURFboard SB5100 USB Cable Modem
USB Device psc 1200 (DOT4USB)
USB Device USB Composite Device
USB Device USB Printing Support

 

Hello
I would always suggest getting a PCI network card for your modem as it takes a little of the load off your pc... but as you only seem to be having difficulty with one pc...
Check your firewall settings - if you are using a decent firewall (sygate, kerio) then disable the Windows firewall as it can cause all sorts of network problems.
Tried giving the modem it's own USB port on the pc rather than sharing through a hub?

 

I had this problem before I switched to a router and had no need for USB. Try resetting your cable modem by taking out the power cord for 30 seconds or so and then power it back up. Wait for all the lights to stop flickering and then power on your pc. If the problem still persists try reinstalling the hardware and software, if it came with some.