navalweaponsofficer :
I am making some guesses here since we do not have a full model number. Using the lowest model number with 3GB of ram I am guessing that you have an L355-S7812. This computer is capable of running windows 7 and the drivers for running windows 7 x86 or x64 are on Toshiba's website. You can upgrade the ram to 4GB. Ensure you get your actual full model number before you do anything and double check the site information I gave you.
http://support.toshiba.com/support/staticContentDetail?contentId=2012386&isFromTOCLink=false
http://support.toshiba.com/support/modelHome?freeText=1998632
How do I find the full model number? I haven't been able to locate that.
Here's system summary!
OS name: Vista home based
Version: 6.0.6002 service pack 2 build 6002
MFG: Toshiba Satellite L355
System type: X86-based PC
Processor: Intel(R) Celeron(R) CPU 900 @ 2.20GHZ, 2194 MHz, 1 core(S), 1 Logical
BIOS Version/date: INSYDE 2.10, 9/23/2009
SMBIOS VERSION: 2.4
SYSTEM DIRECTORY: WINDOWS SYSTEM32
Installed memory(ram): 3.GB
Total physical memory: 2.87GB
Available physical memory: 1.29GB
Total virtual Memory: 5.97GB
Available virtual Memory: 4.49GB
Page file space: c:|pagefile.sys
Hard drive is SQ004981V02, 224GB, I'M USING 113.GB
I hope this helps, I can see I need more rams for sure.
Thanks for your help.