USB RAM cannot compensate for physical RAM because the USB data transfer speed is very slow, especially considering the technology of USB your laptop uses it could even be slower than the hard disk. Generally speaking the laptop is a relic for archaeologists to find. That being said there are some things you can try to boost the performance a little bit, but do not expect miracles and even running a browser today consumes a lot of resources as such old machines struggle a lot.
So what I recommend doing are the following. Preferably in the order I write the steps so you won’t need to go back and forth all the time
1: First off I strongly recommend starting with a clean slate and format your PC. If that can’t be done then run an antivirus antimalware program to make sure your system is clean.
2: Disable AERO themes in windows 7/8
3: Uninstall unnecessary programs and free up disk space
4: Disable programs from starting up with your PC that are not needed. Most programs have such options but they do not type in run: “msconfig.exe” and it will bring up start-up options
5: Disable unnecessary services and those draw a lot of resources. Find a guide like “ black viper services guide” and disable services that are not needed. To bring up the services menu type in run: “Services.msc”
6: Increase virtual memory allocation so that RAM extends to your hard disk
7: Download and install “CCLEANER” free version. Clean up everything and then run multiple times Registry cleanup.
8: Defragment your hard drive
Following these steps will boost the performance and possibly rendering the laptop somewhat functional but as I have said do not expect miracles.